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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Which of the following materials are used for preparing blur-black ink? 1 Gallic acid 2 Ta..

Answer / sona

tannik acid

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Which of the following materials are used for preparing blur-black ink? 1 Gallic acid 2 Ta..

Answer / guest

(4) All of these

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