Tek-Select Reagent Alcohol 95%, 1 Gallon. Tek-Select Reagent Alcohol is composed of 90 parts ethyl alcohol, 5 parts methyl alcohol, and 5 parts isopropyl alcohol, v/v blend. Preferred mixture for dehydrating tissue samples prior to embedding and microscope slide staining. Tek-Select Reagent Alcohols are suitable for most histological procedures. 1 Gallon Bottle.