K9 Glass Crystal

K9 glass was also called synthetic Crystal, it would be wrong, K9 glass is formed by the melting silicon dioxide as the main raw material, but were added during the melting 24% of lead, in fact, is lead glass; why should lead it? General glass blue or green, does not look like Crystal, but leaded glass after a high degree of white, looks a lot like Crystal, especially with 24% K9 glass like Crystal, so called K9 glass crystal is more appropriate.