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

How to Calculate Dilution Ratio in the Darkroom - Darkroom Discussions

September 12, 2015  •  Leave a Comment

I discuss how to correctly figure out the amount of chemical for the total volume desired to be used for any dilution factor.  Watch the video, and be sure to share your comments, or ask questions in the section below.  

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

- Determine required ratio by dividing final volume by dilution factor: 1000ml/100 = 10ml (developer)
- Subtract the ratio volume from the final volume:  1000ml - 10ml = 990ml (water)
- Measure out 990ml of water, add 10ml PyroHD developer to it, mix thoroughly

Example - 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!

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

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