Hydrargotype
REF #79
2
1
1
Operating procedure
The entire process is carried out in the dark, including the drying stage.
1. Mix all the components in the following order:
a/ Ammonium ferric oxalate
b/ Cyanomercurate
c/ Oxalic acid
2. Spread onto the sheet
3. Leave to dry for 60 minutes
4. Expose (45 minutes)
5. Rinse with water for 1 × 30 seconds
6. Brighten with 1% oxalic acid for 1 minute
7. Rinse thoroughly with clean water
1. Mix all the components in the following order:
a/ Ammonium ferric oxalate
b/ Cyanomercurate
c/ Oxalic acid
2. Spread onto the sheet
3. Leave to dry for 60 minutes
4. Expose (45 minutes)
5. Rinse with water for 1 × 30 seconds
6. Brighten with 1% oxalic acid for 1 minute
7. Rinse thoroughly with clean water