Lactic Reagent

Lactic acid reagent

Solution A To 60 mL of lactic acid add 45 mL of previously filtered lactic acid saturated without heating with Sudan red G; as lactic acid saturates slowly without heating, an excess of colorant is always necessary.

Solution B Prepare 10 mL of a saturated solution of aniline. Filter.

Solution C Dissolve 75 mg of potassium iodide water and dilute to 70 mL with the same solvent. Add 10 mL of ethanol (96%) and 0.1 g of iodine. Shake.

Mix solutions A and B. Add Solution C.