Flint Glass Sheet

ja:フリントガラス板
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==Used in Recipes==
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==Obtained from Desynthesis==
==How to Obtain==
==Historical Background==
Flint glass is optical glass that has relatively high refractive index and low Abbe number (constringence of a transparent material). With respect to glass, the term flint derives from the flint nodules found in the chalk deposits of southeast England that were used as a source of high purity Silica by George Ravenscroft, circa 1662, to produce a potash lead glass that was the predecessor to English lead crystal. Traditionally, flint glasses were lead glasses containing around 4–60% lead oxide; however, the manufacture and disposal of these glasses are sources of pollution. In many modern flint glasses, the lead can be replaced with other additives that do not significantly alter the optical properties of the glass. A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet lens because of their compensating optical properties. Flint glass can be fashioned into rhinestones which are used as diamond simulants.