Silberra PYRO-HD B&W Film Developer, 250ml concentrate

Description

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.

Storage

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