Isabella Beeton,
Mrs. Beeton's Book of Household Management
(1907)
“ There is no mistake more common than to suppose that any half-ripe or over-ripe fruit is good enough for jam. Sugar for Preserving.—Of the various kinds of sugar in common use, the white refined lump is generally sold for preserving, and, indeed, is the only kind admissible for the more delicate kinds of preserves. Coarse brown sugar conceals the flavour of any fruit, and the whiter moist sugar has little sweetening power. ”
