----- Original Message ----- From: Philip Pemberton To: Sent: Friday, September 10, 2004 6:22 PM Subject: [EE]: Ferric chloride etchant disposal > Now... Sodium hydroxide looks like it should be easy enough to get - as= suming > I can find the stuff in the first place (and in fairly small quantities= , i.e. > 500g tubs). The problem is the pH paper - I've found a few USA-based se= llers, > but none of them appear to be willing to sell the stuff outside the USA= . Does > anyone know if one of the Hanna Instruments pH meters that Farnell are > selling for =A318 +VAT each would work as a replacement? pH indicator can be purchased as an aquarium consumable in larger pet sto= res. It normally comes in kits. You could also ask a friendly chemist to buy you = a bottle of universal indicator from a lab supply house. Before you shell o= ut for a pH meter find out if you need to calibrate it each time you use it with= a solution of known pH. Regards Sergio Masci _______________________________________________ http://www.piclist.com View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist