Changes in CIE L*a*b* values recorded for 1 ppm of amine vapours.

Control stripes	1-Ha* 8.0 b* 9.96 L* 90.55	2-OMea* 14.64 b* 14.54 L* 76.35	3-OCF3a* 7.58 b* 12.71 L* 89.29
TEA	a* −0.65 b* 5.37 L* 93.41	a* 1.53 b* 6.83 L* 90.96	a* −0.16 b* 1.03 L* 94.45
EtA	a* −0.72 b* 5.10 L* 93.41	a* −1.45 b* 5.39 L* 92.70	a* −0.61 b* 1.36 L* 94.08
Aniline	a* −0.86 b* 6.73 L* 93.33	a* 9.53 b* 11.77 L* 80.20	a* 2.77 b* 5.50 L* 92.30
NH3	a* −0.31 b* 8.01 L* 92.73	a* −0.27 b* 8.35 L* 92.50	a* −0.81 b* 3.02 L* 94.23