Answer:
The end product in the Schmorl reaction is (b) Turnbull blue.
Step-by-step explanation:
The Schmorl technique is a histological staining method used to demonstrate the presence of melanin in tissues. This technique involves treating tissue sections with a solution of 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 blue-black color in the melanin. This blue-black pigment is called Turnbull blue.
Prussian blue is the end product of the Prussian blue reaction, which is used to detect the presence of iron in tissues. Ferric ferrocyanide is also known as Prussian blue and is produced as a result of the reaction. Colloidal iron is a form of iron that is suspended in a liquid and is used as a staining agent in histology.