The ingredients and method are easy to follow.
500ml water + 300 grams of potato
8 teaspoons of washing soda and
2 teaspoons of vitamin C
Add water to make up 1000ml
The procedure is;
Blend 300 grams of potatoes
Add water (500lml) & blend said chunks until you have a smooth soupy mix.
Filter the liquid (I made a 3D printed funnel with a washing up sponge as a course filter).
Mix in washing soda
Mix in vitamin C
Add water to 1000ml @ 20 degrees C
Add to film tank, shake for 30 seconds and then stand develop for 2 hours on 100 ISO film. Stop with water + fix + wash as usual.
Stand developing is basically pouring in the developer and then leaving it to sit for a long time while you enjoy a lovely cup of coffee.
Maybe for future mixes, I'll filter the potato sludge with a Cafetière. it doesn't need to be perfect, just free of big lumps and most of the fine sludge.
The resulting scanned negative is included in the photos for this project. This was a 4" x 5" negative from my MPP Large format camera.