| Since last December, all products must state on the label that they contain any of the eight main food allergens, plus sesame seeds and sulphites. |
| Sulphites give with barium chloride a precipitate soluble in hydrochloric acid. |
| Sulphur dioxide is used to a certain extent in the making of virtually all wine, therefore virtually all wine contains sulfites, or sulphites. |
| Californian organic wines can sometimes contain trace amounts of sulphur or sulphites. |
