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Old 14th April 2020, 07:36 AM
JakubV JakubV is offline
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Default Unnamed pyro formula

A formula from Czechoslovak book "Škola fotografie pre začiatočníkov" (A beginner's handbook of photography) published in 1970 (I believe, mine is from '78 as 4th edition).
I don't know anything but basics about pryro devs, but from little that I researched I didn't find this formula anywhere else

Pyrocatechol.........................5g
Metol.....................................5g
Sodium carbonate (anh.).....40g
Sodium sulfite (anh.)............40g
Water to 1l

Recommended times with 1+4 dilution at 18°C
10-13°DIN (ISO 4-16).......5 min
15-18°DIN (ISO 25-50).....7 min
19-21°DIN (ISO 64-100)...10 min

Book states compensating effect and fine grain.
Any thoughts?
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