Karl P. Koenig (kpkoe@swcp.com)
Sun, 17 Jan 1999 16:34:50 -0700
An important component of gumoil printing is the etching of residual gum
areas with Clorox bleach, in solution with water about 1:6. Can anyone
tell me how to calibrate the bleaching strength that is left in the tray
after several etchings or after a day or more of just sitting there? I
suspect that there is a way of determining the strength in an ideal, fresh
solution and then comparing that measurement and calibrating it against
progressively weaker solutions. Some sort of litmus paper with steps,
maybe? Ideas welcomed, solutions applauded. Karl Koenig
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