Q. 1) Following is a special stain for collagen? a. Haematoxylin and Eosin b. Leishman's c. PAS d. Mallory's Q. 2) Frozen slab technique of mixing zinc phosphate is used for- a. cementing crowns b. temporary dressing c. base d. cementing orthodontic bands MALLORY or MASSON's TRICHROME is used to stain Extracellular collagen. Collagen is stained blue.. Another stain VAN GEISON's is used,it stains collagen RED.