255 
broader than band II but less strong. Finally the colouring matter 
characterized by the property to dissolve in a 12% acid possesses 
a band in the red which is even stronger and somewhat broader 
than band II. 
The measurement of the position of the bands gave the follo¬ 
wing results: 
Colouring matters soluble in alkalies. 
Basicity: 25 0 / 0 HC1 
solvent: 1% HC1 in alcohol. 
A. Concentration 1 B. Concentration 1 : 3 
Band 1 2 618 — 604 I 2 617 — 605 
„ II 2 589 — 551 II a 2 587 - 574 
IIb 2 569 — 555 
C. Concentration 1 : 6 
max. 611*5 
77 
77 
581 
563 
Colouring matters soluble in 7% and 10% HC1 acids. 
A. Concentration 1 B. Concentration L : 3 C. Concentration 1 : 6 
Band I X 650 — 633 I X 649 — 637 max. X 644 
„ II X 618 — 605 II X 617 — 606 „ 610 
„ HI X 591 — 550 Illa X 588 — 576 „ 581 
lllh X 571— 555 „ 562 
Colouring matter soluble in 12% HC1. 
A. Concentration 1 B. Concentration 1:3 C. Concentration 1 : 6 
Band I X 653 — 633 I X 651 — 636 max. X 644 
a II X 618 — 605 II X 617 — 607 „ 610 
„ III X 589 — 548 III a X 586 — 577 „ 580 
Illb X 569 — 557 „ 560 
Colouring matters insoluble in alkalies. 
solvent: 1% HC1 in alcohol 
soluble in 7°/ 0 HC1 
Band I X 645 — 631 
a II X 617 — 602 
a HI X 587 — 550 
soluble in 10% HC1 
X 649 — 633 
X 618 — 603 
X 590 — 552 
soluble in 12% HC1 
X 650 — 632 
X 616 — 602 
X 587 — 548 
III > II > I 
III > II > I 
III > I = II 
The colouring matter soluble in 2-5% HC1 does not show band I. 
On further dilution band III undergoes a change similar in cha- 
