What is this paint for?

I bought 3 tins for this in a Homebase clearance, thinking it was for radiators and skirting. But now I’m thinking that this is just for mixing with other paint. Also not sure what colour it is either. I thought is was white.

I bought 3 tins for this in a Homebase clearance, thinking it was for radiators and skirting. But now I’m thinking that this is just for mixing with other paint. Also not sure what colour it is either. I thought is was white.