[darkroom] C41 Chemical Update

[sen]

I did a 13th roll in our C41 chems this evening, which did not come out
properly. Bad colour cast and the backing came out brown, both of which
indicate exhausted chemistry. The chemicals are rated for 12 rolls, so I
guess they mean it! This roll was intentionally a test roll, so no big
deal.
I've disposed of the CD/stop/stabilizer and stored the blix in a discard
bottle in the closet. We had ordered 5L worth of chemistry and this was
our first litre, so I mixed up a new litre of chemistry and ATrain did a
roll in them which confirms they're all good.
Looks like we'll get 60 rolls out of a 5L which cost us ~$120, so $2 per
C41 roll give or take. Not bad! Downtown Camera charges $6/roll for C41
processing.
 -sen