Here a brief description of the formulas and proportions that I use to get the classic solution Van Dyke Brown and a modified one to prevent the deposit of silver salts.
Classic VDB solution
Following Wynn White independently prepare three solutions:
A 33ml H2O and 9.0g green ammonium ferric citrate;
B 33ml H2O and 1.5g tartaric acid;
C 33ml H2O and 3.8g silver nitrate.
Combine solutions A and B, mix and then slowly add the solution C to A + B, constantly stirring. Leave ageing for a few days before use.
VDB2 solution
To avoid the deposit you get when you add C into A+B use the following modified formula.
A 33ml H2O and 9.0g green ammonium ferric citrate;
B 33ml H2O and 4.0g tartaric acid;
C 33ml H2O and 3.8g silver nitrate.
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