Haft-rang

Haft-rang (هفت رنگ "seven colours") is a Persian term for a decorative technique for underglazed ceramic tiles. This decorative technique is also sometimes described as "cloisonné", "cuerda seca" or "black line". The process begins with the application of multiple colours on square tiles coated with a white glaze. The colours are delineated with black painting so that they do not bleed into each other. Finally, the whole tile is fired in one step. This technique is decorative and relatively easy to deploy, especially compared to Mo'araq, but it does not permit an optimum firing process for each of the colours. Hence the colours are weaker, less intense, less clearly delineated, and the glazes not as strong.

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