﻿ Tim Layton Fine Art | How to Calculate Dilution Ratio in the Darkroom

# How to Calculate Dilution Ratio in the Darkroom

September 12, 2015  •  1 Comment

In this article, I discuss how to correctly figure out the amount of chemical for the total volume desired to be used for any dilution factor.

This can be confusing because people sometimes use different terms to try and explain the same concept.

Anytime there is measurement involved, confusion often follows.

Watch the video and let me know if my approach is clear.

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EXAMPLES

How would you prepare 1000ml of a 1:100 dilution for PyroHD?

Step 1: Determine the required ratio by dividing final volume by dilution factor: 1000ml/100 = 10ml (developer)

In this case we know that we want to mix 1000ml of PyroHD and we want it diluted at 1:100.

Step 2: Subtract the ratio volume from the final volume:  1000ml - 10ml = 990ml (water)

Step 3: Measure out 990ml of water, add 10ml PyroHD developer to it, mix thoroughly

It really is that simple.

Here is another example using a different dilution so you can practice.

Try and figure out the two parts (developer and water) for the dilution before looking at the answer to make sure you understand how to use the process.

MORE EXAMPLES

Dilute HC110 1:63
final vol / dil factor
1- 500ml/63 dilution factor = 8ml (developer)
2 - 500ml - 8ml = 492 (water)
3 - mix two together and enjoy!

Dilute Stop Bath 1:19
final vol / dil factor
1- 500ml/19 dilution factor = 26ml (stop bath chemical)
2 = 500ml - 26ml = 474ml (water)
3 - mix the two together

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