Day 237~366

The process of glass blowing is long , hot, and arduous and would take far too long to write about here, but I can heartily recommend visiting a glass blowing factory and seeing it in action if you ever get the chance. Glass colouring and colour marking may be obtained by the addition of colouring ions,by precipitation of nanometer sized colloides (so-called striking glasses such as “gold ruby”or red “selenium ruby”), by colored inclusions (as in milk glass and smoked glass), by light scattering (as in phase separated glass), 5) by dichroic coatings (see dichroic glass), or 6) by colored…