HAMES Laboratory Method for the Preparation, collection, and submission of tissues:
Preparation of 10% Formalin Solution

To make 10% Formalin Solution use 100 ml of 37% tech. grade Formalin and 900 ml tap water. Since Formalin is solution of 37% formaldehyde in water, 10% Formalin Solution is equivalent to 3.7% formaldehyde in water.