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 3

Discriminating power for blue, black, green and red inks using UV/Visible spectroscopy.

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,BL5;BL2,BL3;BL2,BL4;BL2,BL5; BL2,BL6;BL3,BL4;BL3,BL6;BL4,BL5;BL5,BL6 (11)	BL1,BL4;BL1,BL6;BL3,BL5; BL4,BL6 (4)	11/15=0.73
Black	6	65/2=15	BK1,BK2;BK1,BK4;BK1,BK5;BK1,BK6;BK2,BK3;BK2,BK4; BK2,BK5;BK2,BK6;BK3,BK4;BK3,BK5;BK3,BK6; BK4, BK6; BK5,BK6 (13)	BK1,BK3;BK4,BK5 (2)	13/15=0.87
Green	4	43/2=6	GN1,GN2;GN1,GN4;GN2,GN3;GN2,GN4;GN3,GN4 (5)	GN1,GN3 (1)	5/6=0.83
Red	2	21/2=1	RD1,RD2 (1)	None (0)	1/1=1