In shades of pencils like HB 2B 4B 6B 10B what is the full form of B?
And what is the full form of HB
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In shades of pencils like HB 2B 4B 6B 10B what is the full form of B?
And what is the full form of HB
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And these are the hardness of the grades of 2B,4B,6B etc.