Moersch Separol HE is a powder developer for black and white paper with a stabiliser solution, making 1 л of stock.
What it is for
Separol is a line built for modern European safety rules: no hydroquinone, no caustic alkalis, reduced sulphite. The main developing agent is an ascorbic acid derivative, so mixing the solution poses no health risk, and under current EU rules the developer is not classed as environmentally hazardous. It suits all common papers.
How to dilute it
A litre of stock makes 8 to 15 litres of working solution.
The solution is replenishable — kept and reused, with development time extended as it exhausts. Keep count of the films put through it; that is the only way to avoid an underdeveloped roll at the end of its life.
Storage
Sealed powder keeps for years; mixed solution keeps far less well, so mix what you will use. Dissolve at the stated temperature and in the stated order — getting the order of components wrong ruins a developer more reliably than any timing mistake.
How it compares
If your darkroom is cramped, has no extraction, or you simply would rather not handle hydroquinone, this is the most direct swap for a classic paper developer with no loss of print quality.
