Such is the powerfully aversive effect of food colour out of context.

Add the black food colour if using and mix well to combine.

Put the icing sugar and the black food colouring into a bowl.

Only 19 children completed a double blind placebo controlled challenge study with artificial food colours.

But Gobi Aloo Sag is yellow so I put red food colouring into it before I eat it.

It's staining some freshly marinated trout so intensely it looks as if someone has tipped a bottle of food colouring over my dinner.