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2015-10-20T15:47:46+05:30

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The full from of  HB pencil is hard and black. it is said as hard and black to indicate the darkness and the hardness of the lead used in the pencil

hope so answer is useful
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2015-10-20T15:59:16+05:30

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Hb pencil refers to hard and black . Therefore in painting we use these pencils so that the lead doesn't break and it is dark enough. 
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