Redwood Foods versions of these are sold in Holland and Barrett, Asda and wholefoods shops. Gravy granules. Just because you're feeding a vegetarian or vegan doesn't mean they have to have 'vegetarian' gravy (you know, the thin watery stuff that looks like a dissolved vegetable stock cube).
If your tongue is stained black or dark brown it may be caused by medications and certain foods/drinks. Drinking several cups of coffee or tea per day may stain the tongue; some people who supplement with green drinks containing chlorophyll may notice a very green tongue.
Causes of a change in tongue color. A bright pink color on the tongue is most often due to a deficiency in iron, folic acid, or vitamin B-12. An allergic reaction to gluten can also cause this. A white tongue is usually a result of smoking, drinking alcohol or poor oral hygiene. White lines or bumps may be an inflammation called oral lichen planus.