Supracolor is a greasepaint formula, but don't be frightened by the word 'grease' - the texture is quite similar to a MAC cream colour base. I find these grab and hold pigment spectacularly well, but also allow eyeshadows to be blended. Lots of other brands make products that are good eyeshadow bases, but these blend nicely into the skin and at £5.50 for an 8g pot, they're less expensive than alternatives from MAC or Urban Decay, for example. They also come in a huge array of colours. The packaging is not pretty, and Kryolan products do all have a sweet floral scent, but if you're looking for a reasonably priced eyeshadow base you'd be hard pressed to beat these.
The iridescent two-tone effect of the pigment is much more apparent with the supracolor base. Like many e-tailer pigments, Convicted is much finer and less sticky than a MAC pigment, and really needs a base to bring out the colour - I tried to pack it on to the other eye, but without a base or any moisture it is very difficult to make it stick. I like using a dark base shade to make an easy smoky eye, but there is a large selection of flesh toned shades to chose from in the supracolor line too.
I bought mine at Charles Fox in London, who do also run a mail order service.