Samuel Pepys, Diary of Samuel Pepys — Volume 22…
“ If it comes out, either of them, either the gold above eleven, as very fine will sometimes within very little of what it went in, or the silver above eleven and two pennyweight, as that also will sometimes come out eleven and ten penny weight or more, they are so much above the goodness of the standard, and so they know what proportion of worse gold and silver to put to such a quantity of the bullion to bring it to the exact standard. ”
