7.1 Aniline (Warning—Aniline should not be pipetted directly
by mouth because of its extreme toxicity. Aniline is also
toxic by absorption through the skin even in very small
quantities, and should be handled with great caution.) Distill
chemically pure aniline and dry as needed to meet purity
requirements for use, discarding the first and last 10 %. Aniline
thus prepared when tested with n-heptane according to Section
9 shall give an aniline point of 69.3 6 0.2°C (156.7 6 0.4°F)
as determined from the average of two independent tests
having a difference of not more than 0.1°C (0.2°F).