The Rarity of Glass
Glass is a rarity in Braided Shore, since the sand in the region is unsuitable for glass production.
Sand from the land of the Selka is different from the one in Braided Shore, and that one can be heated into glass. The situation of the glass-unsuitable sand of Braided Shore has given the Selka a monopoly of glass items, which is one of their biggest trade advantages. The Golden Ledger forbids the export of any raw sand from the Selka lands, so any glass found in Braided Shore is very likely of Selka make, and imported such.
Attempts have been made by court mystics – egged on by demanding princesses and covetous monarchs alike – to make Braided Shore glass, but to no avail. What did come out of those experiments was the material of alchemical porcelain, however.