Soldered seams are treated with acid. On the right is a seam before patina is applied: it’s clear and shiny. On the left is a seam treated with acid: it’s dark and obscure.
Stained glass has long been used in architecture. The light shining through stained-glass windows is painted in different colors, obeying the artist’s every whim. And the transparent pattern that covers the window like a flame is permeated by sunlight. You have a chance to find out how Russian artisans make stained glass.
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