Gram staining sequence is: (A) Carbol fuchsin – Iodine – Acetone – Methyl violet, (B) Methyl violet  –  Iodine – Acetone – Carbol fuchsin, (C) Methyl violet – Acetone – Iodine – Carbol fuchsin, (D) Carbol fuchsin – Acetone – Iodine – Methyl violet
Answer is B. Primary stain – Crystal violet or Methyl violet 
Mordant – Gram's iodine
Decolorizer – Acetone or Ethanol
Secondary stain – Safranin or Carbol fuchsin