Artist Description by Mike Shelbo:
"Cobalt-5 is very dense in colour concentration, yet not as stiff in workability as Cobalt-6.
Be sure to use a neutral flame with this colour as it can be susceptible to over reduction that will leave grey patches or streaks.Cobalt-5 is great for stringers and blown work that will leave you with a true deep cobalt. Sandwich between clear layers and blow out thin for a vibrant and beautiful cobalt blue transparent.
Works nicely, and melts easily into itself with no mark or sign of where glass was added. My favourite Cobalt-5 quality is that it shines through the colour when it is brightly back lit. - Mike Shelbo