What brand of food colouring to make a blue sponge cake?

[Ventingtura]

I can only find blue food colouring for icing.

Can anyone advise?

I've never seen any food colouring that's only for icing??? What sort of blue are you aiming for?? Sugarflair is a really concentrated product so you'd get a really strong blue

I bought Cake Decor blue food colouring - the only blue food colouring in Morrisons and Sainsburys.

Put some in sponge mix as recipec and the colour just disappeared.

On closer examination the label said 'add 1 tsp to 250g icing for a pale blue colour'.

FusionChefGeoff Thanks for the Sugar flair recommendation. That too seems to be aimed at sugar rafters and says it can be used tobcolour butter cream.

I'm after a product that will make the inside of a sponge (the sponge bit) blue.

I’ve baked with the Wilton food colour paste before in macarons and it worked very well. The pastes tend to be bolder than liquids, so you need less of them for a better colour. These are the ones I have.

I’ve used sugar flair to make a rainbow sponge cake and they worked perfectly

All the colours for the sponge on this cake were Wilton Gel colours. Found a set of 6 on Amazon but I'm sure they do them separately.

food colouring is food colouring . How much did you use?
you need to add enough to turn the batter blue

I’ve done this with the Wilton gel type