Chemistry Mixing Calculator
Mix darkroom chemistry stock solutions from powder and liquid concentrates. Select a recipe, set your target volume, and get precise quantities for each chemical.
Mix a recipe
Select a recipe and target volume to calculate quantities
ml
D-76 — 1000ml
| Chemical | Quantity | Unit |
|---|---|---|
| Water (50°C) | 750 | ml |
| Metol | 2.00 | g |
| Sodium Sulfite (anhydrous) | 100 | g |
| Hydroquinone | 5.00 | g |
| Borax | 2.00 | g |
| Water to make | 1000 | ml |
Temperature: Start with water at 50°C to dissolve powders. Allow to cool before use.
Mixing order
- Heat 750ml of water to 50°C.
- Dissolve Metol completely, stirring gently.
- Add Sodium Sulfite and stir until dissolved.
- Add Hydroquinone and stir until dissolved.
- Add Borax and stir until dissolved.
- Add cold water to make the final volume.
- Allow to cool to working temperature before use.
Safety
- Always add chemicals to water, never water to chemicals.
- Wear gloves and eye protection when handling powder chemicals.
- Work in a well-ventilated area.
- Potassium Hydroxide (in Rodinal) is extremely caustic — handle with extreme care.
- Never mix chemicals near food preparation areas.
- Dispose of exhausted chemistry according to local regulations.
Water quality
Use distilled or deionised water for best results. Tap water is acceptable for stop bath and fixer.
Shelf life
Stock solutions keep 6–12 months in full, sealed bottles. Working dilutions should be used within 24 hours.
Stay in the loop
New tools, guides, and limited print drops. No spam, unsubscribe anytime.
Track your chemistry batches with Silverlog
Coming soon