Which of the following materials are used for preparing blur-black ink?

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Categories >> Sciences >> General-Science

Question	Which of the following materials are used for preparing blur-black ink? 1 Gallic acid 2 Tannic acid 3 Ferrous sulphate 4 All of these
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I also faced this Question!!		Rank	Answer Posted By

Answer	tannic acid	0	Raj Thakre

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