Question

Hair dyes contain

• A. copper nitrate
• B. gold chloride
• C. silver nitrate
• D. copper sulphate

Hint:

Metallic hair dyes use salts like AgNO\(_3\) which form coloured compounds on reaction with hair proteins.

Answer 1

The Correct Option is C

Step 1: Identify common metallic salts used in dyes.
Certain permanent hair dyes historically used metallic salts for colour formation.
Step 2: Role of silver nitrate.
Silver nitrate reacts with sulphur-containing compounds in hair and forms dark silver compounds (silver sulphide), giving black/brown shade.
Step 3: Conclude.
Thus, silver nitrate is used in hair dye formulations.
Final Answer:
\[ \boxed{\text{(C) silver nitrate}} \]