Betsy Porter
Art and Iconography
MAKING AND USING SHELL GOLD
Art and Iconography
MAKING AND USING SHELL GOLD
 |  |  |  |  |  |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| All rights reserved. |
Back to Step by Step
Back to Gallery of Icons
Back to Loretta Hoffmann
Back to Gilding
Back to Highlighting
Back to Main Technical Page
Back to Gallery of Icons
Back to Loretta Hoffmann
Back to Gilding
Back to Highlighting
Back to Main Technical Page
SHELL GOLD ASSISTE;
FINE GOLD LINES APPLIED OVER PAINT
Method learned from Dmitri Andrejev
There are several methods of applying gold leaf lines, known as "assist" or "assiste," over egg tempera paint.
Some artists use concentrated dark beer or dried garlic juice to apply a sticky coating in small areas, then adhere
gold leaf sheet or tiny pieces of gold leaf over that. I have not tried this technique, but it appears to result in a
"flaky" effect and relatively coarse lines. With shell gold assiste, you can make your gilded lines and edges
noticeably thinner and more precise.
Shell gold, so named because it was historically made and stored in a shallow shell such as a clamshell, consists
of finely powdered gold leaf mixed with gum Arabic. It is mixed with a bit of water and applied over paint in fine
gold lines. After drying an hour or so, it can be burnished to a high sheen, using an agate stone or a metal
burnishing tool. With its gum arabic binder, it is relatively fragile and is best applied late in the process.
Apply as third highlight in fine parallel lines, rays, and small highlights. Although shell gold may be applied over
any color, the base color to which it is applied (usually orange or red-orange) is typically dark enough to set off
the brilliance of the gold, and should be smooth in texture. Other highlights are not necessarily used on that color.
This technique requires experience with highlighting, and is not recommended for beginners.
Shell gold was used in many historic icons, often quite extensively, and especially for the golden garments of the
Christ Child and for the gold trim on Mary’s garments. It also appears in many contemporary icons.
Although you can buy shell gold, I have not heard favorable reports of the ready-made product. You can make
your own from gold leaf and gum Arabic, although it’s a lot of work. Use 4 or 5 sheets of water-gilding (not patent)
real gold leaf, 23K or higher – including the leftovers from gilding. Liquid or powdered gum Arabic, commonly
used with watercolors, is available from art supply stores. You will need a shallow sauce dish with smooth rounded
interior, 5 inches diameter or smaller, preferably heavy white porcelain. Do not use a plastic dish.
Prepare yourself, because both of your hands will be covered with sticky goop for an hour. Drink your coffee,
wash up, make your phone calls, whatever you might plan for the coming hour. Assemble sauce dish, gold leaf,
liquid gum Arabic, distilled water, and 2 eye droppers. Thoroughly wash and dry your hands.
Pour liquid gum Arabic the size of a dime into the sauce dish.
Add a sheet of gold leaf to the dish. Strike the gold leaf with your finger, a series of quick decisive pats, to shatter
it into tiny pieces and gradually pound it into a powder. Pat pat PAT pat pat pat pat. Do not rub or stroke the gold
leaf, which would cause it to roll up and become hard to break. Work quickly, before gum Arabic starts to dry.
When the first round of gold leaf is free of visible particles and is no longer shiny, add another sheet of gold leaf,
and repeat. Repeat again, for a total of 4-5 sheets of gold leaf. Then add leftover scraps of gold leaf. By this
time, the mix will be extremely thick, sticky, and infuriatingly hard to handle, like dry peanut butter. You may add a
very small amount of liquid gum Arabic as you work. When all gold leaf is broken up, add one drop water.
Roll and grind the mix with your finger, for at least 45 minutes. When the mix gets really dry, add a drop of
water. When adequately ground, the gold mix should develop a noticeable pearlescent sheen.
Use eyedropper to add distilled water, and wash the gold powder from your fingers and the dish into it – the gold
will swirl beautifully into the water. The gum Arabic dissolves, and the gold settles to the bottom of the dish. Cover
the dish with plastic wrap and let stand at least one hour, preferably overnight.
FINE GOLD LINES APPLIED OVER PAINT
Method learned from Dmitri Andrejev
There are several methods of applying gold leaf lines, known as "assist" or "assiste," over egg tempera paint.
Some artists use concentrated dark beer or dried garlic juice to apply a sticky coating in small areas, then adhere
gold leaf sheet or tiny pieces of gold leaf over that. I have not tried this technique, but it appears to result in a
"flaky" effect and relatively coarse lines. With shell gold assiste, you can make your gilded lines and edges
noticeably thinner and more precise.
Shell gold, so named because it was historically made and stored in a shallow shell such as a clamshell, consists
of finely powdered gold leaf mixed with gum Arabic. It is mixed with a bit of water and applied over paint in fine
gold lines. After drying an hour or so, it can be burnished to a high sheen, using an agate stone or a metal
burnishing tool. With its gum arabic binder, it is relatively fragile and is best applied late in the process.
Apply as third highlight in fine parallel lines, rays, and small highlights. Although shell gold may be applied over
any color, the base color to which it is applied (usually orange or red-orange) is typically dark enough to set off
the brilliance of the gold, and should be smooth in texture. Other highlights are not necessarily used on that color.
This technique requires experience with highlighting, and is not recommended for beginners.
Shell gold was used in many historic icons, often quite extensively, and especially for the golden garments of the
Christ Child and for the gold trim on Mary’s garments. It also appears in many contemporary icons.
Although you can buy shell gold, I have not heard favorable reports of the ready-made product. You can make
your own from gold leaf and gum Arabic, although it’s a lot of work. Use 4 or 5 sheets of water-gilding (not patent)
real gold leaf, 23K or higher – including the leftovers from gilding. Liquid or powdered gum Arabic, commonly
used with watercolors, is available from art supply stores. You will need a shallow sauce dish with smooth rounded
interior, 5 inches diameter or smaller, preferably heavy white porcelain. Do not use a plastic dish.
Prepare yourself, because both of your hands will be covered with sticky goop for an hour. Drink your coffee,
wash up, make your phone calls, whatever you might plan for the coming hour. Assemble sauce dish, gold leaf,
liquid gum Arabic, distilled water, and 2 eye droppers. Thoroughly wash and dry your hands.
Pour liquid gum Arabic the size of a dime into the sauce dish.
Add a sheet of gold leaf to the dish. Strike the gold leaf with your finger, a series of quick decisive pats, to shatter
it into tiny pieces and gradually pound it into a powder. Pat pat PAT pat pat pat pat. Do not rub or stroke the gold
leaf, which would cause it to roll up and become hard to break. Work quickly, before gum Arabic starts to dry.
When the first round of gold leaf is free of visible particles and is no longer shiny, add another sheet of gold leaf,
and repeat. Repeat again, for a total of 4-5 sheets of gold leaf. Then add leftover scraps of gold leaf. By this
time, the mix will be extremely thick, sticky, and infuriatingly hard to handle, like dry peanut butter. You may add a
very small amount of liquid gum Arabic as you work. When all gold leaf is broken up, add one drop water.
Roll and grind the mix with your finger, for at least 45 minutes. When the mix gets really dry, add a drop of
water. When adequately ground, the gold mix should develop a noticeable pearlescent sheen.
Use eyedropper to add distilled water, and wash the gold powder from your fingers and the dish into it – the gold
will swirl beautifully into the water. The gum Arabic dissolves, and the gold settles to the bottom of the dish. Cover
the dish with plastic wrap and let stand at least one hour, preferably overnight.
For a particularly radiant and glowing effect, indicating divine
energy, SHELL GOLD highlights the robes of Christ Emmanuel.
Left, by Betsy Porter; Right, by Loretta Hoffmann
energy, SHELL GOLD highlights the robes of Christ Emmanuel.
Left, by Betsy Porter; Right, by Loretta Hoffmann
For practice or an easy non-traditional substitute assiste, use a mica pigment such as Jacquard Pearl Ex
657 Sparkle Gold, mixed with yellow ochre and egg tempera base. This is less luminous than shell gold and
cannot be burnished, but it’s still very pretty, especially for thin borders. Work carefully, because mica pigment
will smear if you try to remove it.
You can also paint radiating "assiste" lines as part of the second or third highlight, using the pigment
mix recommended for that highlight, to attain some of the stylistic effect of shell gold assiste.
657 Sparkle Gold, mixed with yellow ochre and egg tempera base. This is less luminous than shell gold and
cannot be burnished, but it’s still very pretty, especially for thin borders. Work carefully, because mica pigment
will smear if you try to remove it.
You can also paint radiating "assiste" lines as part of the second or third highlight, using the pigment
mix recommended for that highlight, to attain some of the stylistic effect of shell gold assiste.
Next morning, carefully remove liquid, first by slow cautious pouring, then with
an eye dropper. Let the remaining liquid evaporate. There’s your shell gold!
It does not look very impressive, but you have enough for one or more icons.
Store covered with plastic wrap, enclosed in a zip-lock sandwich bag.
On a copy of your drawing, plan the shapes and lines where shell gold will be
applied. Paint them for practice and to verify location. Shell gold cannot be
removed without smearing.
Shell gold is applied as "combs of light" with the rays running in the direction
of the folds. Lines should be evenly spaced and usually parallel. A few larger
spots, usually triangles or parallelograms, may be added for emphasis.
Against a dark background, the entire figure meay be outlined in gold. Study
reproductions of historic icons to develop your assiste highlighting technique.
To use shell gold, add just one drop of water, mix, and paint it on, repeating
for 2 or more coats until the gold covers underlying paint. When the gold
paint gets dry, add another drop of water. Powdered metal is rough on paint
brushes, so use a dedicated brush, and rinse thoroughly.
When the shell gold on the icon is thoroughly dry (allow at least an hour),
burnish the gold with the fine point of your stone or metal burnisher.
an eye dropper. Let the remaining liquid evaporate. There’s your shell gold!
It does not look very impressive, but you have enough for one or more icons.
Store covered with plastic wrap, enclosed in a zip-lock sandwich bag.
On a copy of your drawing, plan the shapes and lines where shell gold will be
applied. Paint them for practice and to verify location. Shell gold cannot be
removed without smearing.
Shell gold is applied as "combs of light" with the rays running in the direction
of the folds. Lines should be evenly spaced and usually parallel. A few larger
spots, usually triangles or parallelograms, may be added for emphasis.
Against a dark background, the entire figure meay be outlined in gold. Study
reproductions of historic icons to develop your assiste highlighting technique.
To use shell gold, add just one drop of water, mix, and paint it on, repeating
for 2 or more coats until the gold covers underlying paint. When the gold
paint gets dry, add another drop of water. Powdered metal is rough on paint
brushes, so use a dedicated brush, and rinse thoroughly.
When the shell gold on the icon is thoroughly dry (allow at least an hour),
burnish the gold with the fine point of your stone or metal burnisher.