How to Calculate Dilution Ratio in the Darkroom
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.
Be sure to share your comments, or ask questions in the section below.
Free Darkroom Diary Newsletter by Tim Layton
* indicates required
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.
Dilute HC110 1:63
Dilute Stop Bath 1:19
ANALOG PHOTOGRAPHY TRAINING LIBRARY
Read Testimonials from photographers and collectors from around the world.
Buy Your Photography, Video, & Technology Gear at No Additional Cost To You From B&H Photo
Fujichrome Provia 100F - Fujichrome Velvia 100 - Fujichrome Velvia 50 - Kodak Portra 160 - Kodak Portra 400 - Kodak Ektar 100 - Fujicolor Pro 400H - Fujicolor Crystal Archive Silver Gelatin RA4 Paper - RA-4 Color Print Processing Developer & Processing Chemicals - Color Darkroom Enlargers
ILFORD B&W FILMS & DEVELOPERS
KODAK B&W FILM DEVELOPERS
DARKROOM SUPPLIES & EQUIPMENT
Note: I participate in affiliate programs where I earn a small commission on some select products that I provide links for on my website at www.timlaytonfineart.com. When you use these links, I earn a small commission and there is no additional charge to you.
Keywords: analog photography, black and white, darkroom, film, fine art, large format photography, photography, silver gelatin
Technically Pyrocat HD has parts A and B so would be 1A:1B:100W so you need 10+10+980 to get a Liter. And then there is also decisions about the correct dilution for ones processing method. 2A:2B:100W for Rotary seems to be the norm, while 1A:0.75B:200W may be appropriate for semi-stand method.
I would like to see a deeper dive article on minimum and maximum developer in dilution per square inch for a given processing system and what the impacts are. Especially as it relates to square inches of film for a single sheet of 4x5 vs 8x10 or processing multiple 8x10 sheets. Example the basic HC110 at normal 1:31 can create too much contrast for a single 4x5 sheet in a tank following published times, and too little contrast if processing 3 8x10s in a Jobo tank.
No comments posted.
Recent PostsWhy Following Your Heart as a Photographer Will Lead You To Your Ultimate Success Hodgson Mill - Dry Plate Diary June 05, 2021 New One on One Analog Photography Workshops Available With Tim Layton Silver Gelatin Dry Plate Storage Tips For Long-Term Preservation Silver Gelatin Dry Plate Developer Formulas Kodak D-49 & D-19 & Bonus Tips and Info New Handmade Silver Gelatin Emulsions Community Darkroom Diary Episode 8 - May 25, 2021 Darkroom Diary Episode 7 - May 21, 2021 Darkroom Diary Episode 6 - May 20, 2021 Darkroom Diary Episode 5 - May 19, 2021