Attributes

Brand	-
Category	Office Equipment, Supplies & Services / Photo Printing Equipment
Origin	-
Brand	Paisen
Model Number	BW-65
Volume	5 Liters
Chemical Type	Hypo Clearing Agent / Washing Accelerator
Compatible Media	Black & White Film and Photo Paper
Dilution Ratio	1:4 to 1:9 (Configurable)
Capacity per Liter	Approx. 20-30 rolls of 35mm film
Shelf Life (Unopened)	24 Months
Storage Temperature	15°C to 25°C (59°F to 77°F)
Package Contents	1x 5L Concentrate Bottle, Usage Guide

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Perfect for high volume work

As a photography student, I go through chemicals quickly. This 5L bottle is economical and the dilution instructions are clear. It handles heavy loads of photo paper without losing effectiveness.

Anonymous

Mar 28, 2026

Rating: 5/5

Essential for quick turnaround

This washing accelerator significantly cuts down my processing time. The archival wash is thorough, and I love that the 5L size lasts me several months even with weekly developing sessions.

Anonymous

Mar 22, 2026

Rating: 5/5

Consistent results every time

I have been using Paisen products for years. The BW-65 ensures my negatives are completely free of fixer residue. My prints have never looked cleaner or lasted longer.

Anonymous

Mar 19, 2026

Rating: 4/5

Solid performer

Does the job well. Reduced my washing time from 30 minutes to about 10 minutes while maintaining archival quality. Smell is mild compared to other brands I've tried.

Anonymous

Mar 12, 2026

Rating: 4/5

Great value for darkrooms

Works exactly as described for both film and paper. The only reason for 4 stars instead of 5 is the cap design, which can be a bit tricky to pour without a funnel. Otherwise, excellent product.

Anonymous

Mar 03, 2026

Rating: 5/5

Highly recommended for B&W enthusiasts

If you are serious about black and white photography, this is a must-have. It prevents staining and ensures long-term stability of your images. Fast shipping too!

5 FAQ

Q: What is the recommended dilution ratio for photo paper?

A: For photo paper, we recommend a dilution ratio of 1:4 (one part concentrate to four parts water) for optimal clearing and washing acceleration.

Q: How many times can I reuse the working solution?

A: The working solution can typically be reused for 20-30 rolls of 35mm film or equivalent sheet film/paper area, depending on the load. Discard if you notice slowing clearing times or cloudiness.

Q: Does the 5L bottle come with a measuring cup?

A: The package includes the 5L concentrate bottle and a detailed usage guide, but a measuring cup is not included. Standard laboratory graduated cylinders work best for mixing.

Q: Is this product safe to pour down the drain?

A: While less toxic than older hypo solutions, please check your local environmental regulations regarding chemical disposal. We recommend neutralizing and disposing of it at a hazardous waste facility if possible.

Q: Can this solution be used for color film development?

A: No, the Paisen BW-65 is specifically formulated for Black & White film and photo paper. It is not suitable for C-41 or E-6 color processes.

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