Copper Sulfate Bleach

This formula is from Tim Rudman’s ‘The Master Photographer’s Lith Printing Course‘, a book now out of print but readily available secondhand. Many of the materials mentioned in the book are sadly no longer available, but the techniques hold good with the few modern papers remaining.

Copper (Cupric) Sulfate..................................50 g
Concentrated Sulfuric Acid (EXTREME CARE!)..............6.5 ml
Sodium Chloride (Common Salt)........................... 50 g
Water to make..........................................1000 ml

IMPORTANT NOTE: Always add strong acids to water slowly and NOT water to acid.
This formula makes a stock solution that is diluted 1+9 with water for dish use. The stock has a very long shelf life and the diluted working solution will bleach around 3-4 10×12″ prints before exhaustion.

Bleaching should be carried out on a thoroughly fixed and washed print. The use of hypo clearing agent after an initial wash, followed by further washing, is recommended.

Bleaching is initially slow at this 10% dilution, but suddenly proceeds rapidly. Using this dilution enables more control should only partial bleaching be required.

3 Responses to Copper Sulfate Bleach

  1. Pingback: Slavich Unibrom – First Prints | Real Photographs

  2. Pingback: Slavich Bromportrait in LD50 | Real Photographs

  3. Pingback: Slavich Bromportrait: Two-Pass Lith | Real Photographs

Leave a Reply

Your email address will not be published. Required fields are marked *

*

Highslide for Wordpress Plugin