My procedure for mixing Pyrocat-MC "A"
Tom and Keith,
Thank you for your replies.
I like to try the recommandation for the Pyrocat MC developer but Iam not a chemist. So I need a clear description of what to do. In that case I extracted, from some other threads about this subject, the parts I need for this. What you see below is the information and formulary from Gadget Gainer and Sanking. For me there are some questions about the Pyrocat MC. First the amount I need for the potassium carbonate and second the temperature for the warm glycol.
In the same thread I read something about leaving the TEA, which has some influence on the selflife.
Formulary of Pyrocat MC (by Gainer and Sanking)
A-Part
2,5 g
metol
4,0 g
ascorbic or erythorbic acid
8,0 g
TEA (about 7 ml at room temp) (does this mean dissolve 8,0 g TEA in 100 ml water?)
1 tsp
water
50 g
..pyrocatechol
B-Part
???
.potassium carbonate
Preparing A-Part
Mix the Metol, Ascorbic acid, TEA and Water to make a slurry.
After this fill up with water to make ¼ liter.
Let stay for a while untill its more fluid.
Add some warm propylene glycol (at which temp and how much is sufficient??) (or ethylene)
Transfer to a larger container
add 50 g Pyrocatechol, keep it warm during stirring till it gets clear
Fill up with water to make 1000 cc
Preparing B-Part
??? Potassium carbonate
Fill up with water to make 1000 cc
Mixing 1:1:100
FP4+ @125
Temp @
...
21°
-
.24°
....-..26,5°C
dev-time - 7:30 min - 7:15 min - 5:30 min
Is this, after some questions to be answered, the right way to give it a go?
Your help will be greatfull and many thanks in advance.
My(Tom Hoskinsons) procedure for mixing Pyrocat MC
Pyrocat MC "A" Concentrate
Triethanolamine @38°C (100°F)------------- 8ml
Distilled or Deionized water @38°C (100°F)--- 8ml
Metol ----------------------------------2.5 gram
Ascorbic Acid --------------------------4.0 gram
Pyrocatechol ---------------------------50.0 grams
Propylene Glycol @38°C (100°F) ---------600ml
1. Place a 250ml or 300ml Pyrex beaker in a water bath (water about 115° F - 46°C) Pour the warm Triethanolamine and Water into the beaker and mix them together (I use a magnetic stirring hotplate - but a stirring rod or paddle will also work ok).
2. Stir the Metol and Ascorbic Acid into the mixture of Triethanolamine and Water, after the mixture has become fluid and uniform, allow it to sit for about 10 or 15 minutes, and then mix in about 200ml of the warm Propylene Glycol. Stir until the solution is uniform in color and viscosity.
3. Transfer the 200ml + solution obtained in Step 2 to a 1 liter container (I use a Pyrex Beaker). Rinse the small beaker from Step 2 with warm Propylene Glycol 38°C (100°F), then pour the glycol rinse into the 1 liter container (while stirring).
4. Stir the remaining warm glycol into the mixture in the 1 liter container. Keep the 1 liter container in a warm water bath or on a hot plate such that the glycol mixture temperature is maintained between 120°F and 130° F (49°C - 55°C) When the mixture is uniform, stir in the 50 grams of Pyrocatechol. Continue stirring until the mixture is again uniform, then add sufficient warm 38°C (100°F) Propylene Glycol (with stirring) to make a total volume of 1.0 liter.