Fig. 4
From: New insights into iron-gall inks through the use of historically accurate reconstructions
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40494-018-0228-8/MediaObjects/40494_2018_228_Fig4_HTML.png)
Raman spectra for the ink reconstructions, applied on filter paper, λ = 785 nm
From: New insights into iron-gall inks through the use of historically accurate reconstructions
Raman spectra for the ink reconstructions, applied on filter paper, λ = 785 nm