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Trett
Trett (or tret) was an allowance made up until the early 19th century, for waste, dust, and other impurity in items in commerce, generally amounting to 4 pounds in each 104 pounds (3.85%). It fell into disuse because merchants preferred to simply adjust the price, rather than make a calculation for trett.
==Usage==
Trett was most commonly used in calculating the true weight for imported commodities to Great Britain which would be sold by the pound avoirdupois. From the gross weight, tare weight would be deducted, to account for the weight of any container that the commodity was enclosed in. The remainder was known as the ''suttle''. Trett was deducted from the suttle at the rate of four pounds for every 104 pounds of commodity, to take account of any dust, sand, and other impurity included in the suttle. The remainder, after trett was deducted, became known as the "neat weight" or "nett weight", a term used in common for commodities in which no trett was to be deducted, but from which tare had been deducted.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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