Bought some ready-made (Barts) from Waitrose yesterday; the garlic is pure white, the ginger yellow as expected, so I now feel even more confident that the strange yellow colouration in my home-made five-week-old refrigerated-but-unfrozen g&g paste is just the ginger content and not signs of something malevolent developing ;D
Both use sunflower oil as the carrier; the garlic has, in addition, traces of salt, lemon concentrate and tartaric acid, while the ginger has sugar, citric acid, salt, acetic acid, stabilisers : xanthan & guar gum, and preservative : potassium sorbate.
** Phil.