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Why ia it difficult to trace pen over a material written with pencil. we all know that pencil is made up of graphite and pen ink contains many materials like glycol. It's not a subject question, but i was wondering it! |
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Answer» Why ia it difficult to trace pen over a material written with pencil. we all know that pencil is made up of graphite and pen ink contains many materials like glycol. It's not a subject question, but i was wondering it! |
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