Slight resinous matter (rust) and slight amounts of dry mould on wrappers, bale surfaces and interior sheets, found at the time of delivery will not be objected to. Should “rust” or “dry mould” in an appreciable extent appear on more than 10% of the bales sampled, it shall constitute grounds for rejection. Slight blemishes in colour, small bubbles and small specks of bark are permissible to the extent shown in the sample. Oxidized spots or streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible. The rubber must be dry, strong and free of blemishes, blisters, sand, dirty packing and all other foreign matter other than those specified above as permissible.