Table 2 Range of values measured for the absorption features in the reflectance spectrum and inflection points in the first derivative transformation of cochineal- and madder-based pigments in this study

λ_shoulder

~ 485–497 (∆ ~ 12 nm)

~ 469–481 (∆ ~ 12 nm)

λ_abs,1

520–538 nm (∆ = 18 nm)

500–509 nm (∆ = 9 nm)

λ_abs,2

555–574 nm (∆ = 19 nm)

~ 538–548 nm (∆ ~ 10 nm)

1st inflection point

496–503 nm (∆ = 7 nm)

~ 486–490 nm (∆ ~ 4 nm)

2nd inflection point

533–545 nm (∆ = 12 nm)

520–524 nm (∆ = 4 nm)