Using: as สาร whitening to brighten skin and cure melasma in creams, lotions, serums or gels Mixing method: Mix in water-phase, water-soluble directly, formula should have pH in the range of 3-8, usage rate. : 3% (if using more than 3% must be registered as a melasma treatment If used less than 3% can be registered as a cosmetic.) Product appearance: white powder with pH range 6.5-7.5 Solubility: soluble in water. Storage: Store in a refrigerator at a temperature of 6-8 degrees. Close the bottle tightly. and then sealed from sunlight or heat, the product has a minimum age 4 years
?and it takes two hours, morning and evening, is that okay