[1][2] Both Bols and Hiram Walker produce artificially colored red versions of the liqueur (either of which contribute the pink hue to Pink Squirrel cocktails) while Noyau de Poissy from France is available in both clear (blanc) and barrel-aged amber (ambre) versions.

Although the chemical was not normally present in a dangerous intensity, bottles of 19th-century Noyaux left for decades in the cellar would sometimes have all the cyanide float up to the top, with lethal results for the drinker of the first glass.

[3] Dorothy Sayers used this peculiarity of the old Crème de Noyaux in her short story "Bitter Almonds" (collected in In the Teeth of the Evidence, 1939).

[6] In 2013, Tempus Fugit Spirits recreated a 19th-century-style Crème de Noyaux – distilling both apricot and cherry pits, amongst other botanicals, and coloring the liqueur with red cochineal, as was done in the past.

Noyau de Poissy is a liqueur made from apricot kernel almonds, macerated or distilled in a superfine alcohol, in the presence, according to the recipes, of fine wine brandy, enriched with plants and subtly flavored.