Silberra A-100

Moderate Contrast Metol-Hydroquinone Photo Paper Developer

# A100

Silberra А-100 Developer is a simplified version of Silberra ST-1 Developer. It can be used while working with test photos or to process test prints. Silberra A-100 is used to get images of neutral colours and normal contrast, and makes dark undertones warmer.

Chemical Composition

Disodium edetate, metol, sodium sulfite anhydrous, hydroquinone, sodium carbonate anhydrous, potassium bromide

Preparing Working Solution

Working solution is prepared by pouring the contents of the packs into water while continuously stirring the solution (use glass stick or special plastic stirring stick for chemicals). Distilled or filtered water is strongly recommended.
The method of preparation is as follows:
1) warm 2300 ml of distilled water up to 35-37 Celcium degrees (use mix of hot and cold water, or use microwave to warm up the water);
2) pour contents of pack #1 into the water while stirring until the powder is completely dissolved;
3) pour contents of pack #2 into the water while stirring until the powder is completely dissolved.
Do not begin mixing the contents of pack two until pack one is completely dissolved. If any lumps of powder form in your solution, they can be broken down with your stirring stick. As soon as the working solution is ready (powders are totally dissolved), add cold water to make up to 3 litres and stir.
Then allow the solution to cool to room temperature, nominally 20-22 C. Filtering the solution is not obligatory but recommended option. The solution will be ready to use after 3-4 hours.

Development Times

Silberra А-100 working solution can develop Baryta photo paper for 1-2 minutes, and resin-coated paper for 1-1,5 minutes.

Usage Limits

1 litre of Silberra A-100 Developer working solution can be used to process up to 30 sheets of photo paper of 18x24 cm (or 1,3 sq.m).

Side Effects

The Developer needs constant agitation of liquid or paper (rocking the cuvette with solution, "dragging" or "pulling" sheets).


Keep Silberra A-100 Developer in cool, dry and dark place. Keep away from the children. It is optimal to store your working solution in opaque, chemically inert and tightly sealed containers with minimal air space in order to reduce oxidation.

Expiry Date / Shelf Life

Silberra A-100 sealed powder packs can be stored up to 12 months past the production date; A-100 Developer working solution can be stored for 1 month past the production date, used solution no longer than 5 days past the first use in (a closed bottle).

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.