Phase Separation, Good or Bad?

Title: 
Phase Separation, Good or Bad?
Author/Artist: 
Grimmett, Henry.
Published In: 
Glass Line, v. 17, no. 5, Feb./March 2004, pp. 1-2.
Subjects: 
Bib ID: 
AI61495
Notes: 
Lampworking and flameworking tips.