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Explanation: A "smagrante" sounds like a thinner - so my guess is that it changes the clay to make it more workable - and presumably aso changes the physical characteristics of the fiished product.
From the web:
"All pottery is made from a mixture of rock and mineral fragments (often termed collectively 'inclusions' or - a more loaded term - 'temper') and clay minerals."
In fact rather than "inclusion" I used the term "temper" (which you mysteriously call 'loaded') - the client is reviewing the translation at the moment . If he suggests anything else, i'll post his ideas. 3 KudoZ points were awarded for this answer