Dear Daniele Catone ,

please have a look at the Introduction part of:

https://nano.imun.edu.cn/upload/files/2020/9/fae79401f49e21c1.pdf

It is stated there:

"It is interesting that PB with strong UV−vis absorption can be reduced to Prussian white(PW) with weak absorption in the wavelength range of 500−1000 nm.28"

From that text I assume that the reference 28 may show the Prussian White spectrum...

28) Grandjean, F.; Samain, L.; Long, G. J. Characterization and Utilization of Prussian Blue and Its Pigments. Dalton Trans. 2016, 45, 18018−18044.

This paper is listed as publication on RG, but unfortunately not as full-text:

Article Characterization and Utilization of Prussian Blue and its Pigments

The DOI is:

DOI:10.1039/C6DT03351B

You may have access via your institution and/or request the full-text...

Good luck and

best regards

G.M.

Fig. 8 Here: Article Spectroscopic and Electrochemical Characterization of the Ph...