[Histonet] Black paraffin and cassettes

[Steven P Postl]

A researcher is wondering (now so am I [I never heard this request 
before]) if any company sells black paraffin and black embedding 
cassettes?  No, this isn't a Gothic thing, a legitimate request.  Would it 
be possible to add something to paraffin to make it stay a black color and 
remain strong as our commercial paraffin products?  Thanks.