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


Sorry there is no explanation for this answer. Please help others by posting your response below

How do you rate this queston?  Very Easy  Easy  Average  Above Average  Tough

Previous Question : The mixture of sodium or potassium salts of which of the following chemical substances is Soap?

Next Question : Among the following various types of glasses the one that is used in making lenses and prisms is

Click here for free online test on General Science


 (Getemail alerts when others member replies)

As a captain whose vessel is about to crash on the rocks empties its souls of doubt, so are the hesitant useful for throwing off of an enterprise nearing its end: blame must be cast in failure, profits divided easily in success.
-Bauvard Morsels