Abstract
Ultramarine Blue is an inorganic pigment used for centuries all over the world. This Sodium Alumino Sulfosilicate is known as Lapis Lazuli in its natural form. In 1826, J. B. Guimet invented the synthetic Ultramarine Blue produced through a batch process. It is only in 1993 that Prayon Rupel invented the continuous production process for this pigment. This process has been evaluated and developed for the last 4 years on a pilot plant. Today, the industrial plant is running under the same conditions as the pilot plant. This evolution in production has to bring at least some quality improvement in pigments over the batch process and preferably some specific advantages for the end-users. Some of these studies will be presented in this paper.
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