kwas barbatowy, barbatic acid, Barbatsäure
TLC, spot tests
class: β-Orcinol Depsides
Rf values in standard eluents systems: A: 44 · B: 69 · B': 67 · C: 52
Visibility: in natural light: — · in UV-C (254nm): +
Visibility after H2SO4 spraying and 10 min in 110°C charring:
in natural light: strong to pale yellow, grey halo
in UV-A (ca.360nm): strong purple, pale yellow halo
Spot tests: K — · C — · KC orange · P — · FeCl3 violet-blue
microcrystallization
GE - small rhombic prisms;
GAAn - long needles;
GWPy - delicate thin lamellae