Drain marks on slide film

Hi,

A lab sent out the processed slides with drain marks on the non emulsion side. I spoke with the lab and it was suggested the colder weather increases the chances this could happen. I wondered if it was a drying issue to cause this affect?

Thank you

Probably bad lab practices; unclean or overused final rinse. Of course an air filtration problem in dryer can add to the problem.

Final rinse is cheap, and at a lab scale, water filtration systems are cheap, but some labs still want to save even more. Optimally, final rinse is changed even more often than suggested by the manufacturers, and made to very well filtrated water; then, film is dried with a dryer equipped with good HEPA filters that are changed frequently.

Cold weather sounds like a bad excuse.

another good reason to DIY. Immaculate quality, and a whole lot cheaper too. Plus, very very easy.