Blood Thinning Blood Products - Liquid Bloods can all be thinned with distilled water. You may need to add red, yellow, blue and/or green food color to maintain density of color. Discard left over blood once this procedure is used due to possible contamination of the product. Or the REEL LUNG, AGED or THICK BLOOD can also be thinned with REEL ORIGINAL FORMULA BLOOD. This procedure should not contaminate product provided sterile cosmetic practices are used.