Coloration processes in soda-lime silicate glasses

The effect of mechanical stretching upon room temperature γ coloration of soda-lime silicate (SLS) glasses has been investigated. Optical absorption measurements were performed to follow the formation and thermal bleaching of the induced color centers. It has been shown that the mechanical deformation reduces the coloration effectivity and thermal stability of the created centers. It has been proposed that increase of the concentration of the non-bridging oxygens accelerate the bleaching processes