Sometimes solid fuel briquettes turn white. This happens when salts in the briquette are drawn to the surface as the briquette dries out. The moisture evaporates off, leaving the salt deposit behind on the surface. This is a natural process called Efflorescence and is often seen on newly laid brick work, freshly plastered walls or newly laid concrete.
Salt deposits on the surface of briquettes does not pose any health risks and will not affect the performance of the fuel in any way.
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