And just to make things really weird, I buy "golden Thompson" raisins for my annual fruitcake frenzy.

In Ontario, "sultanas" are small, brown raisins that, if packed without added oil, will form a solid brick. "Currants" (raisins de Corinthe in French) are, as described, small and black -- and quite unrelated to the red and black currants (Ribes cultivars) grown for jam and jelly. "Raisins" are all dried fruits of the grape family.