History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c16.s6.2

v1.c16.s6.2

(ii) Use of manganese is restricted and has been reported from glasses from Kausambi (1. 42%) and Taxila glasses have upto 0.34%. Glasses of violet colour do not seem to be of indigenous origin. Such glasses as reported from Arikamedu and Ter look to be of Roman origin. Use of 0.10% MnO in glasses containing 2.5% Fe2O3 is reported for making colourless glass at Kopia.