Pyrocat-HDC vs. Pyrocat-PC

[Andrew O'Neill]

@John Wiegerink @koraks Thanks guys! That is what I figured. Like many developers that I use, they start at 750ml, then top up to 1 litre. I'm going to use distilled water instead of Glycol, and make really small batches, like I do when I mix up regular Pyrocat-HD.

 

[John Wiegerink]

Hi John,

The formula listed above says to use 750ml Glycol, but then does not say if you top up to 1 litre after mixing in the chemicals. Or am I wrongly assuming that the formula is for a litre?

Andy,
Koraks is right. Curiosity got the best of me, so I did a search and found this quote for Mr. King:

At this time I mix a slightly different version for my own work that avoids any water at all, Pyrocat-HDC. In the HDC formula bromide and metabisulfite are replaced by ascorbic acid. Results with -HDC are virtually identical to the original Pyrocat-HD formula.

Pyrocat-HDC (Solution A mixed in glycol)
Stock A
Propylene Glycol at 150F 750ml
Pyrocatechin 50 g
Phenidone 2.5g
Ascorbic Acid 4.0g
Propylene Glycol to 1000ml

 

[Andrew O'Neill]

Thank you, John.

 

[John Wiegerink]

Thank you, John.