glass for melting in molds

I can't answer your question, but for anyone else not versed in reading headers, you might have mentioned that "here" is The Czech Republic.

Thanks, sorry, you are right, I forgot to mention, that I am from Czech Republic. North Bohemia means north part of Czech Republic, but it is nonsense to suppose, that anybody will know it. Once more thanks, Jan

If you can't buy statisfactory high lead casting crystal in your area in the colors you want, I seriously doubt you can buy it any where in the world as it has been the source for decades. In the states (and presumably) in Germany, the reference would be to Schott Glass

I know that a glass artist named Jayne Persico has a contact with Watorford Crystal in Ireland and she has cast some of their crystal.