Potash-lime glass

There are a number of other glass recipe variations that may be used to yield desired properties. Most likely, these formulations were discovered by accident or in a trial-and-error manner, using materials from their locale and measuring the resultant properties. For instance, the Europeans were the first to discover that K2O, obtained locally from plant ash, could also be combined with lime and quartz to yield a potash-lime glass, later exploited for stained-glass windows. Another popular variation substitutes boric oxide (B2O3) for lime and soda to yield... 

Schreiner, M., I. Prohaska, J. Rendl, and C. Weigel (1998), Leaching studies of potash-lime-silica glass with medieval glass composition using AAS and IRRS, in Tennent, N. (ed.), Conservation of Glass and Ceramics, James and James, London. 

Melcher, M. and Schreiner, M. (2004). Statistical evaluation of potash-lime-silica glass weathering. Analytical and Bioanalytical Chemistry 379 628-639. 

Figure 3 Scheme of the structure of a potash-lime silicate glass. (Note the fourth bond of silicon is out of the plane and not represented in the two-dimensional scheme) (After Scholze, 1988.)... 

Figure 4 Scheme of a potash-lime silicate glass after acidic attack on the surface a... 

Melcher, M., Schreiner, M. (2006) Leaching studies on naturally weathered potash-lime-sihca glasses. /. Non-Cryst. Solids, 352, 368. 

Wipe the potash solution from the outside and inside of the inlet tube of the apparatus with filter paper. Smear a thin film of vaseline on the ground end of the soda-lime tube before replacing it, and fit to the open ends of the apparatus, stoppers of rubber and glass rod, which are not removed, except when the apparatus is in use. As the potash apparatus has jto be... 

---