Dogwood Ceramic Supply

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Duncan Overglazes


Duncan OG 801 Fired Gold   Duncan OG 802 Fired White Gold   Duncan OG 803 Mother of Pearl Overglaze Luster   Duncan OG 805 Premium Fired Gold

    Duncan's OG 801 Liquid Bright Gold as well as the Duncan Premium Gold (OG 805) and White Gold Metallic Overglaze (OG 802) plus the Mother-of-Pearl Luster Overglaze (OG 803) make up the Duncan Overglaze product line.  Overglazes are generally used for decorative fired glazed surfaces and other vitreous surfaces including glass and porcelain.


Duncan OG 801 Fired Gold   Duncan OG 802 Fired White Gold   Duncan OG 803 Mother of Pearl Overglaze Luster   Duncan OG 805 Premium Fired Gold

    As previously noted, the Duncan Overglaze line consists of 1 luster and 3 metallic overglazes.  The OG 802 White Gold, also known as platinum or silver metallic overglaze, is nearly the color of fine white gold jewelry.  OG 805 Premium Gold has a slightly higher gold content and the finished color is slightly deeper, richer and closer to pure gold in appearance.  The OG 801 Liquid Bright Gold has the appearance of fine 18 karat gold jewelry.  All of these metallic overglazes are nearly opaque and should be used over clear or lightly colored overglaze compatible (copper free) glazed surfaces for best results.

 

    Applying the overglaze products to alternative glazes will alter the appearance of the final product.  For example, if the metallic overglazes are applied to a matte or satin glaze the White Gold will take on the appearance of pewter or platinum while both of the Liquid Bright Gold products will appear as a matte or burnished gold.  OG 803 Mother of Pearl Overglaze is not opaque when fired thus applying the product to dark or colored glazes will result in massive color shifts in the final product that can be quite attractive.

 


All of Duncan's metallic overglazes are packed in 2 gram glass vials.  There are 28 grams per liquid ounce.   Dinky Little Bottle   The vial is shown nearly to scale at 100 pixels tall.  One 2 gram vial is nearly enough Fired Gold to completely cover a 12" tall vase or similar art object.


Alternative Packaging:


    The 2 gram vial is the most practical and cost effective means of distributing and handling Liquid Bright Gold and other metallic Lusters.  Alternative size (meaning larger quantity) packaging including the 25 gram and 100 gram vials are available but there is little if any cost saving versus the 2 gram vial.
     Buying even substantially larger quantities maintains the same pricing structure.  It is the opinion of Dogwood Ceramic Supply that the minor price benefit associated with the large size bottles is not enough to counter handling risks associated with the easily broken or spilled large containers.




Duncan OG 803 Mother of Pearl Luster Overglaze


    Duncan's OG 803 Mother-of-Pearl is a translucent luster overglaze that provides iridescence to the glazed surface. Try the Duncan Mother of Pearl over any overglaze compatible colored glaze, even black or crystal glazes, for additional interesting effects.  Duncan's Mother-of-Pearl is packaged in ½ ounce bottles, one bottle should be sufficient to cover about 1 dozen or so 12" tall vases or other art objects.  Yes, a little goes a long ways simply because the product is being applied to an already glaze fired surface that does absorb the material being applied.

    Duncan's Essence (OA 901), also known as Gold Essence, is solvent used for cleaning brushes and/or contaminated wares before the overglazes are applied.  Essence is typically the base solvent used in the Mother-of-Pearl and very similar to the solvent used as the base for the Liquid Bright Gold.  Because Essence is similar to the solvent used in the Liquid Bright Gold, Essence may be used to slightly dilute the Liquid Bright Gold for various techniques.





finished sample using overglazes and lusters

Vase Decorated with Fired Bright Gold
Overglaze Product Usage Information at bottom of this page.





Product Warnings:


    Every Duncan Overglaze product on this webpage includes a caution warning label due the presence of heavy metals and organic solvents in the liquid formula.  Children and women who are pregnant or may become pregnant should never use any of these products. The odors from these products can be especially noxious during product application and firing and may pose additional risks to those who suffer from respiratory diseases.  Please refer to the MSDS on the Duncan website or consult with your health care provider for additional information.

US DOT Warning:  Duncan Overglazes may not be shipped via Air.




Duncan OG 801 Fired Gold OG801 Liquid Bright Gold
2 gram bottle
Caution Label
Manufacturer Suggested Retail $29.95

   

Quantity 1   3  12   144
Dogwood's
Discounted
Price
$29.95 $23.96 $17.97 $14.98
(cost per gram) $14.98 $11.98 $8.99 $7.49



Duncan OG 802 Fired White Gold OG802 Liquid White Gold
2 gram bottle
Caution Label
Manufacturer Suggested Retail $29.95

Quantity 1   3  12   144
Dogwood's
Discounted
Price
$29.95 $23.96 $17.97 $14.98
(cost per gram) $14.98 $11.98 $8.99 $7.49



Duncan OG 805 Premium Fired Gold OG805 Premium Liquid Bright Gold
    2 gram bottle
    Caution Label
     
    Manufacturer Suggested Retail  $44.95

Quantity 1   3  12   144
Dogwood's
Discounted
Price
$44.95 $35.96 $26.97 $22.48
(cost per gram) $22.48 $17.98 $13.49 $11.24



Duncan OG 803 Mother of Pearl Luster OG803 Mother-of-Pearl Luster
    1/2 ounce bottle
    Caution Label
     
    Manufacturer Suggested Retail  $6.00

Quantity 1   3  12   144
Dogwood's
Discounted
Price
$6.00 $4.80 $3.60 $3.00



   
    OA901 Essence (Brush Cleaner)
     
    1/2 ounce bottle
    Caution Label
     
    Manufacturer Suggested Retail  $6.00

Quantity 1   3  12   144
Dogwood's
Discounted
Price
$6.00 $4.80 $3.60 $3.00

 




The Fine Print

Overglazes are Duncan Color Products with the OA or OG product identifications
Discounts apply to quantities of a single OG/OA item number.

Overglaze (OG/OA) products may not be combined together to achieve larger discounts.
Overglaze (OG/OA) products may not be combined with other Duncan Color Products to achieve larger discounts.

Published quantity prices reflect the appropriate quantity discounts (20/40/50%) from the manufacturer's suggested retail price

All Discounted Prices stated are UNIT PRICE are rounded for ease of display.

Cost per gram of the metallic overglazes is provided.

Manufacturer's price adjustment was effective October 17, 2011 and is projected to be valid until at least June 31, 2014.




   Please note:  Even though the actual gold content in Liquid Gold is relatively low, Duncan Enterprises may adjust the product without warning due to the volatility in the price of pure gold.









Duncan Overglazes Have a New Look!


Overglaze label



    The labels on OG 801 Bright Gold, OG 802 White Gold, OG 805 Premium Gold, OG 803 Mother-of-Pearl and OA 901 Essence have been updated!  These labels are compliant in both the United States and Canada, eliminating OG 803C and OA 901C.  The outside of the label contains all necessary warnings, and peels back to reveal the inside of the label, which contains the product directions.


Product Reformulation


    In addition to their new appearance, OG 801 Bright Gold, OG 802 White Gold, and OG 805 Premium Gold have been reformulated for improved performance!  The product flows beautifully from the brush, and the fired color finish is better than ever!  The improved consistency also allows you to get more use from the 2 gram bottle.  The unfired color of the product has also changed slightly:


Unfired OG 801 Bright Gold is now brown (was red)
Unfired OG 802 White Gold remains green
Unfired OG 805 Premium Gold is now red (was brown)


    No formula changes have been made to OG 803 Mother-of-Pearl or OA 901 Essence.



Historical Information

 

    Liquid Bright Gold (aka Fired Gold) has been used in the ceramic industry since the early 1800's to decorate ceramic wares with fine lines such as lettering as well as trimming the rims and edges of dinnerware.  In the last 100 years or so the uses of Liquid Gold have expanded to other markets including various electronics, aircraft, automotive and even aerospace industries as gold is resistant to oxidation and the product is easily applied and fused to the underlying heat tolerant substrate.  Please note, only the gold in the formulation is resistant to oxidation, other metals present in the product formulation may readily oxidize.

   The primary suppliers of Liquid Gold over the past century have been Degussa (Germany), Johnson Matthey (Great Britain), Ferro (USA) and the Hanovia division of Engelhard Industries (USA).  When Engelhard was purchased by BASF in 2006, the Hanovia division was closed and Engelhard (BASF) ceased manufacturing their Liquid Bright Gold and all other fired overglaze products.  The closing of Hanovia did cause a small ripple through the ceramic arts.  However, Duncan Enterprises has used Johnson Matthey as their exclusive supplier for overglaze products over the past several decades, Duncan (and in turn Dogwood Ceramic Supply) was able to continue to offer Liquid Bright Gold with no interruption.

   The actual formula for every brand (Degussa, Matthey, Fusion or Hanovia) of Liquid Bright Gold has traditionally been a solution of gold dissolved into an organic acid and then suspended into a thick solvent based solution for ease of application.  Additional heavy metals, such as chromium, rhodium, indium and even platinum can be added to the gold solution specifically to increase or improve the glossy appearance, surface hardness, color and thickness of the fired result as well as to increase the finished adhesion to the glaze or glass substrate.  These seemingly minor changes in the formulation are quite important to the industrial applications of the product.  The actual amount of gold in the solution can range from a small percentage to as much as 12%.  The fired product is often rated as 18 to 22 Karat in appearance, but those values are subjective not analytically correct due to the small amount of gold in the formula.  In fact, out of side of a few egotistical glory hounds needing to polish their ego's, a very high gold content in the solution does not automatically yield a better product because of firing and application issues.   

 

 







Overglaze Information


    Overglazes can only be applied to any glaze that is overglaze compatible.   For customer convenience, Duncan always marks their glazes with an overglaze compatible (acceptable) statement when the glaze is suitable for use with the Duncan Overglazes.  Some colored glazes by Duncan, especially glazes containing trace amounts of copper, are not compatible for usage with Overglazes and will be appropriately labeled by Duncan.  Most other glaze companies fail to mark their glazes for overglaze compatibility, thus is it up to the final consumer to determine overglaze compatibility.

     Overglazes are a third firing product.  Greenware must be fired to bisque, glaze applied and fired to maturity before the overglazes are applied and fired.



The following information is courtesy of Duncan Enterprises:


Application of Mother of Pearl


Basic Instructions:


1. Be sure that the surface of your piece is free of dust, skin oils and lotions to ensure proper adhesion. Wipe surfaces with rubbing alcohol prior to applying the overglaze (except when used over crackle glazes.).
2. Always apply with a brush that is designated solely for use with Mother of Pearl to prevent contamination.
3. Do not stir or shake glaze.
4. Place a small amount of overglaze on a glazed palette.
5. For a swirled look, swirl on 1 coat, overlapping strokes.
6. For a smooth look, brush on all strokes in the same direction.
7. Correct application should produce a light blue tint.
8. Clean brush in Essence and let dry.
9. Overglazed ware can be fired while it is still wet. The kiln must be clean, well-ventilated (do not overload) and follow a normal firing schedule. Do not touch wet decoration and handle as little as possible until ware is fired to avoid smudging.
10. Stilt and fire OG 803 Mother of Pearl to shelf cone 020.



Tips & Techniques:


1. The appearance of Mother of Pearl will vary with the type of glaze over which it is applied. When applied over a gloss glaze, Mother of Pearl will add a shiny luster. When applied over a matte glaze, Mother of Pearl will add a dull luster.
2. If Mother of Pearl is accidentally applied on the wrong area, dip a cotton swab in Essence and wipe off misplaced color.
3. If any areas are missed, go back and touch up before Mother of Pearl dries.
4. If using a metallic overglaze and Mother of Pearl on the same piece, apply and fire the metallic overglaze first.



Health & Safety:


1. Overglazes contain solvents and should be used in a well-ventilated area. Those susceptible to odors (such as pregnant women) should be especially careful to work only in areas with an adequate ventilation system. During firing, odors are not dangerous but can be highly offensive. These odors quickly leave the area; however, you should not work in the kiln area during firing.
2. Duncan Overglazes can be used on surfaces that come into contact with food and drink. Care must be taken to avoid hard scrubbing when washing overglazed ware, because of the possibility of scraping off the thin layer of metal or luster. Treat your overglazed pieces as you would fine china. Although overglazed ware will take repeated washings in a dishwasher, the overglaze will eventually wear away.



Application of Liquid Bright Gold, White Gold and Premium Gold


Basic Instructions


1. Be sure that the surface of your piece is free of dust, skin oils and lotions to ensure proper adhesion. Wipe surfaces with rubbing alcohol prior to applying the overglaze (except when used over crackle glazes.).
2. Always apply with a brush that is designated solely for use with Bright Gold to prevent contamination.
3. Do not stir or shake glaze.
4. Place a small amount of overglaze on a glazed palette. Apply one smooth coat. Do not let the Bright Gold pool in an area; brush it out smoothly.
5. Correct application should produce a flag red tint.
6. Stilt and fire Bright Gold to shelf cone 019-018.
7. Clean brush in Essence and let dry.
8. Overglazed ware can be fired while it is still wet. The kiln must be clean, well-ventilated (do not overload) and follow a normal firing schedule. Do not touch wet decoration and handle as little as possible until ware is fired to avoid smudging.



Tips & Techniques

 

1. The appearance of Bright Gold will vary with the type of glaze over which it is applied. When applied over a gloss glaze, Bright Gold will be shiny. When applied over a matte glaze, Bright Gold will be dull.
2. If Bright Gold is accidentally applied on the wrong area, dip a cotton swab in Essence and wipe off misplaced color.
3. If any areas are missed, go back and touch up before Bright Gold dries.
4. If using a metallic overglaze and Mother of Pearl on the same piece, apply and fire the metallic overglaze first.
5. For solid coverage with Bright Gold, apply over a yellow glaze or a yellow underglaze covered by clear glaze.



Health & Safety


1. Overglazes contain solvents and should be used in a well-ventilated area. Those susceptible to odors (such as pregnant women) should be especially careful to work only in areas with an adequate ventilation system. During firing, odors are not dangerous but can be offensive. These odors quickly leave the area; however, you should not work in the kiln area during firing.
2. Duncan Overglazes can be used on surfaces that come into contact with food and drink. Care must be taken to avoid hard scrubbing when washing overglazed ware, because of the possibility of scraping off the thin layer of metal or luster. Treat your overglazed pieces as you would fine china. Although overglazed ware will take repeated washings in a dishwasher, the overglaze will eventually wear away.
3. Caution. Do not place pieces with metallic overglazes into a microwave oven. As with any metallic surface, they could cause sparks.




Essence


Basic Instructions


1. Swish overglaze brush in solvent until bristles are free of product. Wipe on paper towel.



Tips & Techniques


1. Use a separate bottle of Essence for each overglaze product. Mark the bottles according to which overglaze product was used. Contamination can result if brushes and/or Essence used with one product come in contact with brushes and/or Essence used with another. For example, if you use Bright Gold and clean your brush in one bottle of Essence, then clean a brush used with Mother of Pearl in that same bottle of Essence, contamination will result and compromise all subsequent firings.



Health & Safety


1. Caution. Flammable. Harmful or fatal if swallowed. Vapor may irritate eyes, skin, and mucous membranes. Contains organic solvents. If swallowed, call a physician. Use in well-ventilated area. Keep out of reach of children.



 

 

 



website last updated: October 2014




Dogwood Ceramic Supply


12590 Dedeaux Road
Gulfport Mississippi, 39503
Telephone (228) 831-4848        Fax (228) 831-3111




Showroom Business Hours:


Monday, Tuesday, Friday and Saturday 10AM to 5PM
Thursday 1PM to 6PM


Closed Wednesday and Sunday