ACRID

Oil, milk (any fatty mucilaginous substance), may protect the coats of the stomach against oil of vitriol and other acrid poisons: -- ACRID

Assimilative Memory or, How to Attend and Never Forget

In other words, someone even less competent than Richard Reid (the couldn't get a shoe to explode guy) would have had to mix smelly liquid chemicals to perform a chemical synthesis in his seat, resulting in a material with a "DISTINCTIVE ACRID SMELL", and then somehow find a way to separate and dry it before even trying to set it off, and to do all that without ANYBODY even in the next seat noticing anything ...

FEAR OF BOTTLED WATER 2006

DOUBLE ACRID CROWFOOT, YELLOW BACHELOR'S BUTTONS; _Nat.

Hardy Perennials and Old Fashioned Flowers Describing the Most Desirable Plants, for Borders, Rockeries, and Shrubberies. John Wood

Illustration A SHIP WAS BLAZING BRIGHTLY ALONGSIDE ONE OF THE WHARVES NEAR THE BRIDGE, AND THE AIR WAS FULL OF DRIFTING SMUTS AND OF A HEAVY ACRID SMELL OF BURNING

The Poison Belt: Being an Account of Another Amazing Adventure of Professor Challenger 1913

ITS FLESH FALLING OFF IN ACRID STRIPS before it ran this picture.

Webster Blog 2009