Treacle

Treacle () is any uncrystallised syrup made during the refining of sugar. The most common forms of treacle are golden syrup, a pale variety, and a darker variety known as black treacle. Black treacle, or molasses, has a distinctively strong, slightly bitter flavour, and a richer colour than golden syrup. Golden syrup treacle is a common sweetener and condiment in British cookery, found in such dishes as treacle tart and treacle sponge pudding.
Etymology.
Historically, the Middle English term was used by herbalists and apothecaries to describe a medicine (also called "theriac" or "theriaca"), composed of many ingredients, that was used as an antidote for poisons, snakebites, and various other ailments. "Triacle" comes from the Old French , in turn from (unattested and reconstructed) Vulgar Latin , which comes from Latin , the latinisation of the Greek (), the feminine of (), 'concerning venomous beasts', which comes from (), 'wild animal, beast'.
Production.
Treacle is made from the syrup that remains after sugar is refined. Raw sugars are first treated in a process called affination. When dissolved, the resulting liquor contains the minimum of dissolved non-sugars to be removed by treatment with activated carbon or bone char. The dark-coloured washings are treated separately, without carbon or bone char. They are boiled to grain (i.e. until sugar crystals precipitate out) in a vacuum pan, forming a low-grade "massecuite" (boiled mass) which is centrifuged, yielding a brown sugar and a liquid by-product—"treacle". Black treacle (molasses) naturally contains relatively high levels of sulphite (>100ppm, expressed in sulphur dioxide equivalent). These levels are deemed safe for the majority of the population, but some allergic and respiratory reactions have been reported particularly amongst asthmatics, such that the United States Food and Drug Administration requires that levels over 10ppm, i.e. >10mg/kg, be declared on the ingredients label.
UK production is almost exclusively from Tate & Lyle. "Black treacle" - Fowlers and Blackie's both referred to it as "treacle" (cf "Golden Syrup"). Tate & Lyle acquired both companies.
In culture.
A traditional Cornish fisherman's celebratory drink is "Mahogany", made from two parts local gin—now usually Plymouth Gin—mixed with one part black treacle.
In chapter 7 of Lewis Carroll's "Alice's Adventures in Wonderland", the Dormouse tells the story of Elsie, Lacie, and Tillie, who live at the bottom of a well. This confuses Alice, who interrupts to ask what they ate for sustenance. "The Dormouse again took a minute or two to think about it, and then said, 'It was a treacle-well.'" This is an allusion to the so-called "treacle well", the curative St. Margaret's Well at Binsey, Oxfordshire.