colored chalk write the school blackboard also known gypsum and mexico pastel white clay that

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Colored chalk to write on the school blackboard. It is also known as gypsum and chalk Mexico or pastel, it is a white clay that Royalty Free Stock Photo

Colored chalk to write on the school blackboard. It is also known as gypsum and chalk Mexico or pastel, it is a white clay that

Colored chalk to write on the school blackboard. It is also known as gypsum and chalk Mexico or pastel, it is a white clay that, prepared in bars, is used to write on the slates.