HOW TO USE THE FLUID For regular cavity work on a normal body, use 2 pints of 5-Purpose Cavity. Larger bodies, or those with extensive putrefaction, may require 3 or more pints according to the dictates of professional judgment. Re-aspiration and the use of additional cavity fluid is usually recommended. For external embalming and/or bleaching, saturate cotton with 5-Purpose Cavity. Apply the cotton pack to the area to be treated and cover the pack with plastic. Let the chemical work overnight if possible.