and sprayed with
Salkowski’s reagent (Ehmann, 1977) and Ehmann’s reagent (mixed
1 volume of 50 mL of 0.2% (w/v) p-dimethylaminobenzaldehyde in
concentrated HCl combined with 50 mL of absolute ethanol and 3
volumes of 2.03 g of FeCl3.6H2O in 500 mL of water and 300 mL of
conc. H2SO4).