I doubt that 10g. will go very far on a big piece, Will. Check with your local chemical supply house to see about larger quantities if you can.
When mixing the LOS for copper, make it considerably weaker than one would for sterling. If you use it too strong, it will flake off. The 1/4" lump in a half quart of water is probably about right, considering that you'll be wiping it on rather than dipping.
You can use a heat gun or soft torch flame to warm the copper as you apply the LOS, too. If it starts to get too dark, just spray it with cold water and start over. Giveit a couple of days to "set" before you set about burnishing back the highlights, too.
It's been a while since I did much with LOS on large copper pieces, but that's what comes to mind. Hope it helps some.
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I doubt that 10g. will go
I doubt that 10g. will go very far on a big piece, Will. Check with your local chemical supply house to see about larger quantities if you can.
When mixing the LOS for copper, make it considerably weaker than one would for sterling. If you use it too strong, it will flake off. The 1/4" lump in a half quart of water is probably about right, considering that you'll be wiping it on rather than dipping.
You can use a heat gun or soft torch flame to warm the copper as you apply the LOS, too. If it starts to get too dark, just spray it with cold water and start over. Giveit a couple of days to "set" before you set about burnishing back the highlights, too.
It's been a while since I did much with LOS on large copper pieces, but that's what comes to mind. Hope it helps some.