What is the different between Eeuwens Y3 medium and MS medium - (May/28/2007 )

NEED help here.............

Can any one tell me what is the functions of Eeuwens Y3 medium???
I had been searching for the net for this particular medium, but unfortunately cant find an answer...

What is the different between the MS medium and Eeuwens Y3 medium???

Thanx a lot!!!

never heard of Eeuwens Y3 medium