Table 1. Abbreviation, name, structure, particle diameter and density of the pigments used.

Abbreviation	Name	Chemical structure	Primary particle diameter/±0.05 μm	Particle density/g cm–3 at 20 °C
PR	Irgalite Red D 3707 (Pigment Red 23)		0.16	1.40
PO	Cromophtal K 2960 (Pigment Orange 64)		0.18	1.59
PY	Paliotol Yellow K 0961 (C.I. a Pigment Yellow 138)		0.17	1.80
PG	Heliogen Grün K 8730 (C.I. Pigment Green 7)		0.16	2.14
PB	Heliogen Blau K 6907 (C.I. pigment 15 : 1)		0.44	1.60
PI	Cromophtal Violet D 5700 (C.I. pigment violet 37)		0.15	1.32
PV	Cinquasia Violet L 5120 (C.I. Pigment Violet 19)		0.12	1.49

^aC.I. = colour index.