Resinotype: Melting rosin + pigment mixture -> question

[Loris Medici <mail@loris.medici.name>]

Alberto, I read your exchange with Keith, about melting rosin +  
pigment mixture and grinding. A question comes to my mind (after  
reading about rosin/colophony in wikipedia): Do we need strictly heat  
the rosin + pigment mixture for grinding? Wikipedia article says rosin  
is soluble in alcohol; can't we just dissolve the rosin in alcohol,  
add the pigment, grind and then wait for the - irrelevant - alcohol  
evaporates?

Thanks in advance,
Loris.