Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Cyanotype print is made by exposing a negative to a paper prepared by soaking in ammonium citrate of iron and potassium ferricyanide. Reason (R): That is why it looks like a blueprint but is permanent. In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A).
• C. (A) is correct but (R) is not correct.
• D. (A) is not correct but (R) is correct.

Hint:

Remember the important facts about Cyanotype: \[ \boxed{ \begin{aligned} \text{Inventor} &\rightarrow \text{Sir John Herschel (1842)}, \text{Chemicals} &\rightarrow \text{Ferric Ammonium Citrate + Potassium Ferricyanide}, \text{Colour} &\rightarrow \text{Prussian Blue}, \text{Common Name} &\rightarrow \text{Blueprint Process}. \end{aligned} } \] Mnemonic: “Cyanotype = Blue Print with Blue Chemicals.”

Answer 1

The Correct Option is B

Concept: Cyanotype is an early photographic printing process invented by Sir John Herschel in 1842. The process involves coating paper with a light-sensitive solution prepared from ferric ammonium citrate and potassium ferricyanide. A photographic negative is then placed on the coated paper and exposed to ultraviolet light. After exposure and washing with water, the image develops into the characteristic Prussian blue colour, giving the print the appearance of a blueprint. Cyanotype prints are valued for their permanence and resistance to fading under proper storage conditions.

Step 1: Examine Assertion (A). The chemicals mentioned are correctly used in the cyanotype process, where a negative is exposed onto sensitized paper. \[ \boxed{\text{Assertion (A) is Correct}} \]

Step 2: Examine Reason (R). Cyanotype prints resemble blueprints because of their deep blue colour and are generally permanent photographic prints. \[ \boxed{\text{Reason (R) is Correct}} \]

Step 3: Check whether (R) explains (A). The Reason describes the appearance and permanence of cyanotype prints but does not explain why the process uses ferric ammonium citrate and potassium ferricyanide. Therefore, \[ \boxed{\text{Both (A) and (R) are correct, but (R) is not the correct explanation of (A).}} \] Hence, \[ \boxed{\text{(B)}} \]