Hi Noor,

This is interesting indeed, but have you verified using freshly prepared reducing agent? I work with plant based synthesis, dominantly but never observed so.

Dear Noor Ul Ain many thanks for posting this very interesting technical question on RG. In this context it might be helpful reading the answers given to the following closely related questions:

What is the reason for green colour of silver nanoparticle?

https://www.researchgate.net/post/What_is_the_reason_for_green_colour_of_silver_nanoparticle

(4 answers)

and

What is meant by different colours of Silver NPs?

https://www.researchgate.net/post/What-is-meant-by-different-colours-of-Silver-NPs

(8 answers)

Apparently this is a phenomenon that has already puzzled other researchers. Good luck with your work and best wishes, Frank Edelmann

Frank T. Edelmann thank you so much for the reply. It is actually quite helpful and made it easier to understand the phenomenon.