Table 1.7   Guidelines for adding of processing supplement Material Processing supplement - when Metals When the material is adapted to small or special dimensions and forms, or the material is subjected to hardening or polishing Wool, cotton, cellulose fibres, other vegetable fibres and plastic materials When the material is used as textiles (covering dyeing etc.)   Wood When wood is used for manufacture of furniture Flat glass When flat glass is used for manufacture of safety glass Meat, fish and shellfish, fruit and vegetables When the material is deep-frozen, processed into tinned food, mash or other corresponding processing, including manufacture of   slices of meat and ready-made food) Milk At manufacture of butter, cheese, milk powder etc. Eggs At manufacture of egg powder Sugar and cocoa At manufacture of sweets, including toffee and chocolate Cereals At manufacture of bread Burnt clay When the material is glazed