Charcoal dust is usually effective to detect fingerprints. If not you could try Fingerprint spray.
my head
no there is not a better substance
they could use something like: fingerprint spray or the super-glue trick
Use Light Because It Shows What The Finger Print Looks Like.
The iodine test will detect the presence of starch in the endosperm.
The iodine test is used to test for starch. It reacts with starch to produce a purple blackish color.
Iodine can detect starch, which is a polymer of glucose
In plant histology, iodine is commonly used as a stain to detect the presence of starch in plant tissues. Iodine reacts with starch molecules, forming a blue-black color complex. This staining technique helps identify storage tissues such as roots, tubers, and seeds, where starch is abundant.
The iodine value is the measure of the unsaturation of fats and oils. It is expressed as the number of grams of iodine absorbed by 100 g of the fat under the test conditions used.
An iodine solution is used.
Baking powder, baking soda, or iodine.
Fluorescein staining