Paterson 45ml Measuring Graduate: Mixing Small Developer Batches
By Austin Camera | Published: 2026-11-03
Category: How-to Guides
Use a 45ml graduate to measure small developer volumes accurately, avoid common mixing errors, and keep your darkroom chemistry consistent batch after batch.
Quick answer
Use the Paterson 45ml graduate to measure developer concentrate and water in small, repeatable batches, then mix them in a larger beaker or tank. Read the meniscus at eye level and rinse the graduate immediately after each chemical.
Why a 45ml graduate earns its place on a small darkroom shelf
A 45ml graduate is the right tool when you mix one-shot developer for a single tank or a few rolls. Larger cylinders make small volumes harder to read accurately, and kitchen measures are rarely marked in the fine increments film chemistry needs. The Paterson graduate's transparent polystyrene body and widely separated markings help you hit exact volumes without squinting.
The trade-off is capacity: 45ml covers small batches only. If your developer recipe calls for more than 45ml of concentrate or water in one pour, measure in two passes or step up to a larger cylinder. For most one-shot developers used at 1+1 or 1+3 dilutions with a single 35mm tank, 45ml is enough.
Read the meniscus, not the top of the liquid
Developer volumes are calibrated to the bottom of the meniscus—the curved surface of the liquid. Set the graduate on a level surface and bring your eye down to the mark. Looking from above adds volume; looking from below subtracts it. This matters most at small volumes, where a 1ml error is a larger percentage of the total.
Keep one graduate for developer and one for fixer
Even with rinsing, residue can carry over. A dedicated graduate for developer and a separate one for fixer or stop bath removes that risk. If you use a single graduate, rinse thoroughly with water between chemicals and dry it before the next measurement. The Paterson graduate is resistant to most photographic chemicals, but that resistance assumes normal use and prompt rinsing, not leaving concentrate sitting in the cylinder.
Step-by-step: mixing a small developer batch with a 45ml graduate
- Set up a level, well-lit work surface: Place the graduate on a flat, non-absorbent surface at eye level. Fill a rinse container with clean water and lay out your developer, water, and mixing vessel before you pour anything. A tilted surface or poor light is the most common cause of off-volume measurements.
- Measure the developer concentrate first: Pour concentrate into the 45ml graduate until the bottom of the meniscus sits on the required mark. For volumes under 10ml, use the finest scale markings and double-check at eye level. Never estimate small volumes by counting drops unless your recipe explicitly allows it.
- Add the measured concentrate to your mixing vessel: Pour the concentrate into a larger beaker or tank, then rinse the graduate with a small amount of water and add that rinse to the vessel so no concentrate is lost. Skipping the rinse leaves developer behind and weakens the batch.
- Measure the water in the same graduate: Rinse the graduate, then measure the water volume your recipe calls for. If the total exceeds 45ml, measure in two passes and keep a tally. Do not fill the graduate past its top mark; use two passes instead.
- Stir gently and check the final volume: Mix the solution with a gentle swirl, then confirm the total volume in your mixing vessel matches the recipe. Small losses during pouring are normal; top up with water if you are short. A final volume check catches measurement errors before they reach the film.
- Rinse the graduate immediately: Rinse the graduate with warm water as soon as you finish, then leave it to air-dry upside down. Do not let concentrate dry on the polystyrene. Dried chemical residue is harder to remove and can affect the next batch.
Product facts
- Paterson Measuring Graduate - 45ml - 1.5 fl oz: Molded from transparent polystyrene with widely separated, easy-to-read markings in metric, Imperial, and US scales. You can measure small developer volumes in the units your recipe uses without converting or guessing between faint lines.
Paterson Measuring Graduate - 45ml - 1.5 fl oz
