Fig. 10
![Fig. 10](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40494-019-0264-z/MediaObjects/40494_2019_264_Fig10_HTML.png)
a Spider diagram illustrating the relative efficiency of the six cleaning systems in removing B-72 layer from painted stone surfaces based on ∆E*, CA, r-FTIR, and relative B-72 layer thickness measurements. b The ranking of the six cleaning systems