I've already tried encasing it in both Ink Blue and CIM's Crocus which not only takes away any devitrification concerns, but is also quite yummy.    From Wordnik.com.  [Effetre Dark Pink...My Half Pound of Destiny.] Reference

It might be imagined that the devitrification would disappear when the glass is heated to the fusing point; and so it does to a great extent, but for many operations one only requires to soften the glass, and the devitrification often persists up to this temperature.    From Wordnik.com.  [On Laboratory Arts] Reference