Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40494-022-00688-4/MediaObjects/40494_2022_688_Fig2_HTML.png)
Raman spectra of common corrosion phases. Offset was applied for better comparison. a Cuprite and tenorite (Tn) (Cu coupon of the Hydroxyethylcelluose test); b anglesite (Pb coupon of the Blanose® 7H4Xf test); c lead formate (Pb coupon of the Klucel® MF test); d massicot (M), plumbonacrite (Pl), basic lead acetate (Pb coupon of the Hydroxyethylcelluose test); e plumbonacrite (Pl), lead acetate trihydrate (Pb coupon of the Hydroxyethylcelluose test)