Ilford Rapid Fixer 1L: Mixing & Storage Tips

By Austin Camera | Published: 2026-10-27

Category: Tips & Care

Learn how to mix and store Ilford Rapid Fixer for black and white film and paper. Get the most from your darkroom chemicals with these practical steps.

Quick answer

Mix Ilford Rapid Fixer as a 1+4 solution for film or 1+9 for paper, use distilled water, and store the working solution in a full, airtight bottle away from light.

Why mixing ratios matter

Ilford Rapid Fixer is a liquid concentrate that needs dilution before use. Using the wrong ratio can underfix or overfix your film or paper, affecting image permanence and wash times.

For film, a 1+4 dilution (1 part fixer to 4 parts water) gives a rapid fixing time of around 2-5 minutes depending on film type and temperature. For paper, a 1+9 dilution works well, though fixing times are longer. Always check the data sheet for your specific paper.

Common mixing mistakes

One frequent error is using tap water with high mineral content, which can cause precipitation or reduce fixer activity. Distilled or deionized water is recommended for consistent results.

Another mistake is mixing too much working solution at once. The concentrate has a long shelf life, but the working solution degrades faster. Mix only what you need for a session.

Step-by-step mixing and storage guide

Step 1: Prepare your workspace and water: Use a clean measuring container and distilled water at room temperature (68-75°F / 20-24°C). Avoid metal containers as they can contaminate the fixer. Common mistake: Using tap water can introduce minerals that reduce fixer life.
Step 2: Measure and mix the concentrate: For film, mix 1 part concentrate with 4 parts water (1+4). For paper, mix 1 part concentrate with 9 parts water (1+9). Add the concentrate to the water, not the other way around, and stir gently. Checkpoint: Always double-check your ratio before pouring. A 1+4 mix for paper will overfix and waste chemistry.
Step 3: Test fixing time: Use a film clip test: drop an undeveloped film leader into the fixer and time how long it takes to clear. Double that time for your actual fixing time. For paper, follow the manufacturer's recommended time. Common mistake: Assuming a fixed time without testing can lead to underfixed negatives that fog over time.
Step 4: Store the working solution properly: Pour the working solution into a dark glass or PET plastic bottle, filling it to the brim to minimize air exposure. Label it with the dilution ratio and date. Keep it away from direct sunlight and heat. Checkpoint: A half-full bottle oxidizes quickly. Use smaller bottles for partial batches.
Step 5: Monitor fixer exhaustion: Keep a log of how many rolls or sheets you've fixed. Ilford Rapid Fixer working solution typically lasts for 20-30 rolls of 35mm film per liter, or until fixing time doubles. Discard when exhausted. Common mistake: Continuing to use exhausted fixer causes incomplete fixing and eventual image deterioration.

Product used in this guide

Ilford Rapid Fixer - 1 Liter: Ilford Rapid Fixer is a non-hardening, liquid concentrate rapid fixer for black & white films and traditional RC and FB photographic papers. It works for both film and paper, so one bottle covers your entire black and white darkroom workflow, but it is not compatible with hardeners.
Ilford Rapid Fixer - 1 Liter