Forensic Discrimination Potential of Blue, Black, Green, and Red Colored Fountain Pen Inks Commercially Used in Pakistan, by UV/Visible Spectroscopy, Thin Layer Chromatography, and Fourier Transform Infrared Spectroscopy

Table 6

Discriminating power of blue, black, green and red fountain pen inks using FTIR.

Color of Fountain Pen ink	n= total no. of samples	Total no. of pairs= n(n-1)/2	Discriminating pairs (total no.)	Non Discriminating pairs (total no.)	D.P=no. of discriminating pairs/ Total no. of pairs
Blue	6	65/2=15	BL1,BL2;BL1,BL3;BL1,BL6;BL2, BL3;BL2,BL4;BL2,BL5;BL2,BL6;BL3,BL4; BL3,BL5;BL4,BL6; BL5,BL6 (11)	BL1,BL4; BL1,BL5; BL3, BL6; BL4,BL5 (4)	11/15=0.73
Black	6	65/2=15	BK1,BK2;BK1,BK3;BK1,BK4;BK1,BK5; BK1,BK6;BK2,BK3;BK2,BK4; BK2,BK5;BK2,BK6;BK3,BK4;BK3,BK5; BK3,BK6;BK5,BK6 (12)	BK4,BK5; BK4,BK6; BK5,BK6 (3)	12/15=0.80
Green	4	43/2=6	GN1,GN3; GN2,GN3;GN3,GN4 (3)	GN1,GN2; GN1,GN4; GN2,GN4; (3)	3/6=0.5
Red	2	21/2=1	RD1,RD2 (1)	None (0)	1/1=1