Silberra PYRO-HD

High-Resolution Equalizing Catechol Film Developer


Silberra PYRO-HD is a concentrated catechol-based equalizing film developer, similar to Pyrocat. The developer provides high-resolution negatives, compensates high contrast and slightly tints the negative in warm tones.
Depending on dilution ratio Silberra PYRO-HD may be used both for normal tank processing ( 1:1:100 dilution) and for stand processing as well ( 1:1:200 dilution ). The developer is supplied as liquid concentrate in two parts, subject to mixing before use.

Chemical Composition

Sodium metabisulfite, catechol, 1-Phenyl-3-pyrazolidone, potassium bromide, potassium carbonate, distilled water

Preparing Stock Developer (mixing instructions)

Working solution is prepared by mixing the concentrates with distilled water in the following order:
1) mix 1 part of Silberra PYRO-HD B concentrate with 1 part of Silberra PYRO-HD A concentrate;
2) dilute the mix of concentrates by 100 parts of distilled water.
For example, to prepare 1 litre of Silberra PYRO-HD stock developer you'll need 10 ml of concentrate A, 10 ml of concentrate B and 1 litre of distilled water.

Development Times

Average development time for most films in Silberra PYRO-HD Developer is 14-15 minutes. Optimal times to process specific films are stated either by manufacturer of the film or can be learned from the table of developing times below.

Usage Limits

Silberra PYRO-HD Developer working solution is recommended for single use only.

Side Effects

The solution makes negatives slightly and very evenly tinted with warm tone.


Keep Silberra PYRO-HD Developer in a cool, dry and dark place. Keep away from children. All the solutions must be kept in tightly sealed bottles, with low internal air volume.

Expiry Date / Shelf Life

Silberra PYRO-HD Developer expiry date is determined by the Concentrate A expiry date that is only 5 months; concentrate B can be stored for 12 months. Stock developer has is non-reusable and must be used within 1 hour after preparation.

Disposal Regulations

Silberra developers and fixers must be disposed of in accordance with the rules and regulations of the country they are used in. Concentrated developers could be toxic and may harm the environment unless disposed in appropriate manner. Silberra recommends to use special disposal services provided by correspondingly licensed organizations which are eligible for photographic chemistry recycling/disposal.

Development Times Table

Developer Film ISO Time, minutes Temperature
PYRO-HD Fomapan 100 100 12 20С
PYRO-HD Fomapan 200 100 7 20С
PYRO-HD Fuji Neopan 100 Acros 100 19 20С
PYRO-HD Fuji Neopan 100 Acros 100 18 20С
PYRO-HD Fuji Neopan 100ss 100 18 20С
PYRO-HD Fuji Neopan 400 400 15 20С
PYRO-HD Ilford Delta 100 Pro 100 45 20С
PYRO-HD Ilford Delta 100 Pro 100 16 20С
PYRO-HD Ilford Delta 400 Pro 400 18 20С
PYRO-HD Ilford FP4+ 125 20 20С
PYRO-HD Kodak TMax 100 100 16 20С
PYRO-HD Kodak TMax 400 400 15 20С
PYRO-HD Kodak Tri-X 400 400 15 20С
PYRO-HD Rollei Retro 80S 80 13 20С
PYRO-HD Rollei Retro 100 100 20 20С
PYRO-HD Rollei RPX 100 100 20 20С
PYRO-HD Rollei RPX 400 400 16 20С
PYRO-HD Tasma A-2 400 18 20С
PYRO-HD Tasma Type-17 320 9 20С