Unicolor Uniprint "Prints from slides" chemistry?

I found some Unicolor Uniprint paper that says "prints from slides" and process only in Uniprint chemistry... Does anyone know what I can use for an alternative? Is it just RA4?

I was planning one trying some direct to positive with this. It is old stuff, no idea how it was stored, but that makes it more fun.

Thanks,
Jason

You need a colour reversal process.

Well, you might try it single stage on your negatives.