For blue-black ink preparation the materials that are used among the following ones are

Options :
  1. Gallic acid
  2. Tannic acid
  3. Ferrous sulphate
  4. All of these
Answer and Explanation :-

Answer: Option 4

Explanation:

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For the unified mind in accord with the Way all self-centered striving ceases. Doubts and irresolutions vanish and life in true faith is possible. With a single stroke we are freed from bondage nothing clings to us and we hold nothing. All is empty, clear, self-illuminating, with no exertion of the mind's power.
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