Film & darkroom
Powder or liquid film developer?
Choose a preparation routine you can carry out consistently.
Two developers can serve the same broad process while demanding different preparation. A liquid concentrate is diluted for use. A powder product may require mixing a complete stock solution first. The practical choice includes your measuring equipment, storage and frequency of processing.
Start with the packet instructions
ILFORD’s powder-developer documentation distinguishes stock preparation from later working dilution. ID-11, MICROPHEN and PERCEPTOL have their own characteristics. Use the instructions for the exact product and packet size; do not divide a dry mixed powder casually into guessed portions.
Evidence: Technical data sheet
Rehearse the preparation
Our preparation worksheet has separate entries for water quantity, mixing order, final volume and cooling before use. Mark the finished bottle with the product and mixing date. For a liquid, write the concentrate amount and final working volume instead. Either routine benefits from a second check before exposed film reaches the tank.
Buy for the work you will do
Estimate the sessions you can realistically complete during the stated storage life. Compare the quantity of usable solution, not only the size of the package. Availability and price vary by country, so record the supplier and date beside each quotation. Ease of preparation is a valid preference; it is not proof of superior image quality.
Sources & further reading
Sources for the specific facts and product descriptions above. Our worked examples, interpretations and practical suggestions are original editorial guidance.
- ILFORD PHOTO — PERCEPTOL, ID-11 and MICROPHEN technical dataTechnical data sheet