Iran_Tiles difference at Sheikh Lotfollah Mosque. Isfahan.

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Describing haft rangi(seven colors) tiles which have lost their color as compared to the durable mosaic tiles.

the new haft rangi (seven-colour) style of tile mosaic. In earlier Iranian mosques the tiles had been made of faience mosaic, a slow and expensive process where tiny pieces are cut from monochrome tiles and assembled to create intricate designs. In the haft rangi method, artisans put on all the colors at once, then fired the tile. Cheaper and quicker, the new procedure allowed a wider range of colors to be used, creating richer patterns, sweeter to the eye.[