[TheForge] "sculpting clay"

[Sheldon]

Hey All

A while ago i was at a friend's who shared his workshop with a blacksmith
who used to own a foundry and was a part time sculptor. I remember seeing a
large hand that he had modelled out of what he called plastercine and he
said that i could make it myself and that he had the "recipe" for me. Well,
as things go i never got the recipe and have since lost touch with the
friend and now i want to make some of that stuff.

I have done some google-ing and it appears that plastercine is the trademark
of a UK toy company so that isn't what i am looking for. If i remember
correctly it was very dark brown almost black,  slightly sticky and it was
quite firm when compared with regular clay and it never dries. I want to use
it to model with and then make casts from. I have come accross plastiline
( an oil based clay) - is this what i am looking for? Does anyone know what
that sort of stuff is and if so, how and with what do i make it? Also, where
can i purchase the necessary ingredients?

Thanks in advance for your help,
Sheldon laing
Hephaestus Forge
Cape Town
South Africa