Hi All
My first response..Pls bear with.
If you go to GA'a site...
http://www.glassalchemyarts.com/ you'll find that Henry Grimmet) has a TON of info on their boro. It does amazing things, can be frustrating, incredibly satisfying and beautiful and basically an exploratory adventure. The GA folks are VERY helpful on-line or on the phone.
Warning: lots of boro color needs really HOT flame...and your eyes need a lot more protection than just rose didymium.....Have fun!!