I have even found contamination in bottled distilled or purified water by filtration, and reverse osmosis. I filter bottled water with a 1 micron spun fiber canister filter. After the final rinse I use a lab wash bottle to wash the negative on last time just before hanging in the drying cabinet. Jonathan Ayers [mail1@xxxxxxxxxxxxxxxxx] -----Original Message----- From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Peter De Smidt Sent: Monday, March 03, 2008 6:36 PM To: pure-silver@xxxxxxxxxxxxx Subject: [pure-silver] Re: how did these scratches happen? Carbon filters can put fine carbon particles in the water, especially when new. These can embed themselves in your wet film, and they're impossible to get out. I know this the hard way. ============================================================================ ================================= 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. No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.21.3/1308 - Release Date: 3/3/2008 10:01 AM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.21.3/1308 - Release Date: 3/3/2008 10:01 AM ============================================================================================================= 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.