Negative Technique

[rene]

Hello,

for the negative technique I use a powder given me by a friend in China. I dissolve this powder in hot water.

Does anybody nows which chemical is this powder?

René

rene@rene-boell.de

[Tetsu Uma]

Is it possibly peach sap or alum?

[Rene]

Yes, I think alum is correct, I will try the peach sap.

[Autor]

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