40 Tanning of leather; leather working; working of leather and furs; tanning of leather or hides; tanning, dyeing and custom assembling of leather materials; leather staining; biomass processing; recycling of clothing to obtain materials for making synthetic fibers; knitting and dyeing of fabrics [treatment of materials]; processing of bamboo, tree barks, rattan, vines or other natural materials; chemical treatment of textiles; preparation and treatment of fabric; applying finishes to textiles; textile treating; recycling of waste and trash; fermenting of food; skin dressing.