B&WLiquid Concentrate

DIY/Homebrew 510-Pyro

Name: DIY/Homebrew 510-Pyro
Brand: DIY/Homebrew

Also known as: Jay DeFehr's 510-Pyro

Jay DeFehr's highly concentrated single-solution pyrogallol formula. The '510' refers to 5% pyrogallol and 10% TEA. Designed for extreme dilution (1:100 to 1:500) for stand development. Produces subtle staining with excellent acutance. Popular with 35mm shooters seeking pyro results without two-solution mixing. Economical due to tiny amounts needed per roll.

Temperature

20°C

18–24°C

Dilutions

Form

Liquid

Characteristics

Grainvery fine

Acutancevery high

Contrastcompensating

Exceptional highlight control with subtle staining

Dilutions

1+100One-shot

Standard 1:100 dilution from stock. Single-solution formula.

1+200One-shot

For extended stand development.

1+500One-shot

Extreme dilution for long stand development (1+ hour).

Shelf Life

Concentrate

1+ year in dark bottles

Working Solution

Use immediately, discard after use

One-shot only. Highly economical due to extreme dilution.

Often Used For

Stand development35mm and roll filmHigh dilution enthusiastsEconomic pyro development

Limitations & Warnings

Pyrogallol toxicity
Single-solution oxidises once opened
Limited published times
Requires experimentation

Descriptions combine manufacturer specifications with community experience. Subjective assessments reflect common sentiment among photographers and may not match your results.

Last verified: Jan 2026Reviewed: Apr 2026Report an error Suggest an edit