IRIDESCENT CLASS.
It is said that this beautiful inanufso fcure originated in some glass works in Bohemia, to which the proprietor was returning after an absence. In order to celebrate his arrival, the workmen lit Bengal lights in the annealing furnaces and the result was that all the pieces of glass in the furnaces became n-ridescent. The- soap-bubble colours ore now produced bv the vapour arising from a mixture ef protochloride of tin. carbonate of baryta, andf carbonate of strontia, which is deposited on the hot gloss before its goes into the annealin'- oven. They can be removed by hard rubbing, The antique irridescent glasses have become so by lapse of time. One firm produced a pearly lustre, like that of shells, by chemical means, including tho use of hydrochloric acid, under pressures of from four to six atmospheres.
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https://paperspast.natlib.govt.nz/newspapers/TS19210428.2.32
Bibliographic details
Star (Christchurch), Issue 16412, 28 April 1921, Page 6
Word Count
139IRIDESCENT CLASS. Star (Christchurch), Issue 16412, 28 April 1921, Page 6
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