Kodak Professional Fixer: Mixing and Usage Guide

By Austin Camera | Published: 2026-10-22

Category: How-to Guides

Learn how to mix and use Kodak Professional Fixer correctly. This guide covers preparation, mixing steps, and common mistakes to avoid for consistent film fixing.

Quick answer

Mix Kodak Professional Fixer by dissolving the powder in warm water, adding cold water to reach one gallon, and stirring thoroughly. Use a clean container and store the mixed solution in a tightly sealed bottle.

Why proper mixing matters

Incorrect mixing can lead to under-fixed negatives that fade over time or over-fixed film that loses detail. Kodak Professional Fixer is a concentrated powder that must be fully dissolved before use. Always follow the exact water temperature and volume specified on the package.

What you need

You need a clean 1-gallon container, a stirring rod, and access to warm (not hot) tap water. Avoid using metal utensils or containers that may react with the chemicals. A dedicated darkroom funnel helps prevent spills.

How to mix Kodak Professional Fixer

1. Prepare your workspace: Set up in a well-ventilated area with a clean, dry surface. Gather a 1-gallon container (glass or HDPE plastic), a stirring rod, and a funnel. Avoid using the same container for other chemicals to prevent cross-contamination. Use a dedicated container for fixer only.
2. Add warm water: Fill the container with about 750 ml of warm water at 32-43 °C (90-110 °F). Do not use boiling water as it can cause the powder to clump or degrade the chemicals. Water too hot can damage the fixer; too cold slows dissolution.
3. Add the powder slowly: Pour the entire contents of the Kodak Professional Fixer packet into the warm water while stirring continuously. Add it gradually to avoid forming lumps. Stir for 2-3 minutes until the powder is fully dissolved. Undissolved powder can cause uneven fixing and spots on film.
4. Top off with cold water: Add cold water to bring the total volume to 1 gallon (3.8 liters). Stir gently for another minute to ensure even mixing. Do not overfill. Check the container's fill line or use a measuring jug for accuracy.
5. Store the mixed fixer: Transfer the mixed fixer to a tightly sealed, opaque bottle. Label it with the date and type of chemical. Store in a cool, dark place away from heat sources. Mixed fixer typically lasts 2-3 months in a full, airtight bottle. Always seal the bottle after each use to prevent oxidation.

Product details

Kodak Professional Fixer - Makes 1 Gallon: This product is only available for Store Pickup only as we are not able to ship photographic chemicals. Plan your purchase ahead and pick it up in-store; you cannot have it delivered. This is common for darkroom chemicals due to shipping restrictions.
Kodak Professional Fixer - Makes 1 Gallon