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Ruby gold glass

Ruby glass was made by irradiating a soda-lime-silicate glass with ca. 0.2 weight % of gold with gamma rays and further
heating instead of using a reducing agent such as stannous oxide. Different colours were obtained by controlling the temperature and heating times. A comparison of this process to develop ruby glass with the conventional ones was made; using this novel process the colours can be better controlled and can be striked only after the artworks are finished. The gamma irradiation facility used was a cobalt 60 source from the Portuguese Nuclear and Technological Institute.