Fig. 7
From: Assessment of violet-blue color formation in Phalaenopsis orchids
pH value in petal crude extracts of various-colored cultivars of Phalaenopsis. (1) P. OX Firebird ‘OX1506 mutant’, (2) P. OX Honey ‘OX1372’, (3) P. Big Chili, (4) P. Sogo Yukidian ‘V3’, (5) P. aphrodite subsp. formosana, (6) P. Purple Martin, (7) P. Kenneth Schubert, (8) P. violacea ‘Indigo blue’, and (9) P. violacea ‘KS1266’