Yes interesting stuff, it is a suspension of pure silver in a medium that makes it plastic. It looks like White blue tack in its plastic state and it can be modelled and moulded. Leave to dry for about 30minues then fire. This burns off the suspending medium and the pure silver molecules unite to form a silver item that is then cleaned with a wire brush and can be burnished with, of all things a knitting needle.
Firing can be done in a kiln, on a domestic gas hob, with a chef’s blow torch or a proper one.
Results can be hallmarked solid silver.