I'd be interested to know if anyone using distilled water had been hit by the dreaded XTOL failure, especially if hard tap water figures into the equation.(posted 8438 days ago)By the way, I e-mailed Kodak after noticing the XTOL package said to mix with water between 65º and 85º. I was told that Vitamin C is sensitive to heat and 85º should be the upper limit.