... the surface of the tube 3. high temp resistant borosilicate colored glass tubes with all kinds of colorscolored glass tube1. made ... to them, such as cutting straightly, firing, melting, polishing, end-closing, frosting, color-printing and etc.. We are the member ... hot or cold processing, which includes firing, cutting, melting, end-closing, frosting, color-printing, pattern and logo-printing and etc ...