Answer:
Melanin can be demonstrated with the (c) Schmorl technique
Step-by-step explanation:
The Schmorl technique is a histological staining method that can be used to demonstrate the presence of melanin in tissues. This technique involves treating tissue sections with a solution containing potassium permanganate, which oxidizes melanin to form a brown pigment. The tissue sections are then treated with a reducing agent, such as oxalic acid or sodium bisulfite, which reduces the excess permanganate and produces a permanent brown-black color in the melanin.
The Prussian blue reaction is used to demonstrate the presence of iron in tissues, while the rhodanine method is used to demonstrate the presence of ferric iron. The von Kossa technique is used to demonstrate the presence of calcium in tissues.