Multiple choice

Which of the following are used as counter stains in Gram staining technique?

P. Crystal violet Q. Safranin R. Iodine solution S. Carbol fuchsin

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Safranin is used as secondary stain (counter stain) in Gram staining technique and carbol fuchsin is sometimes substituted for safranin as counter stain since it stains anaerobic bacteria more intensely.

Keep practicing — related questions