Melting point	152-155 °C (lit.)
Boiling point	179.65°C (rough estimate)
density	1.1712 (rough estimate)
refractive index	1.4434 (estimate)
storage temp.	Store below +30°C.
solubility	DMSO (Slightly), Methanol (Slightly, Sonicated)
pka	7.9(at 25℃)
form	Crystalline Powder
color	White to beige-brown
Water Solubility	SOLUBLE
λmax	269nm(CHCl3)(lit.)
Merck	14,5317
BRN	120895
Stability:	Stable. Combustible. Incompatible with strong oxidizing agents.
CAS DataBase Reference	501-30-4(CAS DataBase Reference)
NIST Chemistry Reference	5-Hydroxy-2-(hydroxymethyl)-4h-pyran-4-one(501-30-4)
IARC	3 (Vol. 79) 2001
EPA Substance Registry System	Kojic acid (501-30-4)

Kojic acid (ActiBiso-KA) is produced by the fermentation and purification of glucose or sucrose under the action of Kojic enzyme. Its whitening mechanism is to inhibit the activity of tyrosinase, at the same time inhibit the activity of n-hydroxyindoleate (dhica) oxidase and block the polymerization of dihydroxyindole (DHI). It is a rare single whitening agent that can simultaneously inhibit a variety of enzymes. 

Kojic acid is an excellent whitening and light spot ingredient. After decades of research and application, it is a classic ingredient that has been tested. As long as the dosage is within a certain range, there is no safety problem and no sensitization reaction will be caused. If the whitening effect brought by VC is expressed by transparency, the effect Kojic acid brings to you is the feeling of smooth milky white. The combination of the two is the best.