Donald Quails wrote:
Caffenol LC is 2 tsp. coffee crystals and 2 tsp. washing soda per 8
ounces
of water -- since I usually use it for 16 mm microfilm in my homebuilt
tank,
which holds two ounces, I mix it as 1/2 tsp. coffee and 1/2 tsp washing
soda.

For Imagelink HQ and Copex Rapid, 25 to 30 minutes at around 70 F seems
about right -- both films tend to thin negatives anyway, if they're to
have
proper tonal range, and the clear base makes them thinner still. The
same
process would likely apply to Tech Pan, but I don't know of anyone
who's
tried it.

The drill for both Caffenol and Caffenol LC is to mix in the soda and
stir
until all cloudiness and grittiness are gone, then add the coffee and
stir
until grittiness is gone again and the solution appears uniform.