After some tests, I found that a 1:200 mixture of 10% povidone iodine and tap water mixed with 5 grams of tapioca starch worked reasonably well. For the standard coffee solution, I brewed 20 grams ...

Mix the starch with the water and vinegar. Then add 2 ml of iodine tincture and rainwater to get a litre of the preparation.

Iodine in water is yellow, and when added to the food color the result ... To one of the tubes containing the mixed solution, add two inches of hexane. Stopper with a cork and shake to mix. To one of ...