Incalmo tests #1 - joining two different colours from our Thames Glass recipes during the blowing process. . . . #thamesglass #ancientglass #localmaterials #riverthames #workingwithwaste #madeintheminimelt #thameswater #minimeltglass #glassdesign #glassblowing #glasschemistry #glassalchemy #glasscolour #incalmo #futurearcheology