> Richard > > Do you happen to have a formula for TC-1? > Very complicated Kodak TC-1 Water 1.0 liter Potassium bichromate 90.0 grams Sulfuric acid, concentrated 90.0 ml There are a number of variations of this which demonstrate mainly that the amounts are not at all critical. The usual Kodak warning holds, add acid to water never the other way. I found out that the stuff is reusable even when it looks quite ugly. Sodium sulfite solution, or Kodak Hypo Clearing Agent will remove yellow stains if any are left. -- Richard Knoppow Los Angeles, CA, USA dickburk@xxxxxxxxxxxxx ..tried that cleaner once on a really dirty Nova Quad (slots were black from colour chemistry I assume). It did remove a lot, but not all.. Best, Cor ============================================================================================================To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.