The factors that influence the fungi growth and aflatoxin production is a container that does not have good aeration, the influence of the atmosphere (CO2 and O2), temperature (250C is the optimum temperature to produce a toxin) and the influence of humidity (RH > 80% is ideal humidity of fermentation) [4]. Furthermore, the reversal also influences the quality of cocoa beans. The reversal aims to ferment cocoa beans evenly. It is usually done 2 or 3 times depending on the seed layer thickness. The reversal once will cause the fungi to grow on the top, thus causing slaty. Whereas, if excessive reversal will cause the fragile cocoa bean [12, 17].