Discrimination of Pakistani Fountain Pen Inks by Gas Chromatography-Mass Spectrometry (GC-MS)

Table 5

Discriminating power for blue, black, and green fountain pen ink samples using gas chromatography-mass spectrometry.

Color of fountain pen ink	n = total no. of samples	Total no. of pairs = n(n−1)/2	Discriminating pairs (total no.)	Nondiscriminating pairs (total no.)	Discriminating power = no. of discriminating pairs/total no. of pairs
Blue	3	32/2 = 3	Bl1, Bl2	0	3/3 = 1.0
			Bl1, Bl3
			Bl2, Bl3
Black	4	43/2 = 6	Bk1, Bk2	0	6/6 = 1.0
			Bk1, Bk3
			Bk1, Bk4
			BK2, BK3
			BK2, BK4
			Bk3, Bk4
Green	4	43/2 = 6	Gr1, Gr2	0	6/6 = 1.0
			Gr1, Gr3
			Gr1, Gr4
			Gr2, Gr3
			Gr2, Gr4
			Gr3, Gr4