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The major difference in processinggypsumis that it must be dehydrated to form calcium sulfate, the major component of coloredchalk. This is done in a kettle, a

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Chalkis a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the ... While it is similar in appearance to bothgypsumand diatomite,chalkis identifiable ... A mixture ofchalkand mercury can be used as fingerprintpowder. ... Lime and Limestone: Chemistry and Technology,Productionand Uses

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A process ofmakingdustlesschalkcomprises step of preparing calcium ... parts of titanium pigmentpowder, 2-3 parts of glycerol and 0-3 parts of pigment. ... The major difference in processinggypsumis that it must be dehydrated to form

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