Asian palm civet digestive juices enter into the beans and modify the micro-structural properties of these beans. Proteolytic enzymes cause substantial breakdown of storage proteins. Kopi Luwak is traditionally made from the faeces of wild civets, however, due to it becoming a trendy drink, civets are being increasingly captured from the wild and fed coffee beans to mass-produce this blend. Many of these civets are housed in battery cage systems which have been criticised on animal welfare grounds. The impact of the demand for this fashionable coffee on wild palm civet populations is yet unknown but may constitute a significant threat. In Indonesia,
Coffee production in Indonesia farmers remove the outer skin from the cherries mechanically, using rustic pulping machines, called "luwak". The coffee beans, still coated with mucilage, are then stored for up to a day. Following this waiting period, the mucilage is washed off and the coffee is partially dried for sale. At least one U.S. manufacturer, soft drink producer Bai, purchases the non-bean remnants of coffee cherries for use in their products. Otherwise, these remnants are discarded. Collectors and processors then hull the coffee in a semi-wet state, which gives the beans a distinctive bluish-green appearance. This process reduces acidity and increases body, resulting