I wasted an hour reading a short story by Robert Louis Stevenson, entitled "Markheim". How could the guy who wrote "Treasure Island" write such a piece of crap? A sermon disguised as a short story.
But I got one good word out of it.
"to sow tares in the wheat field,
I learned that word in a Chem lab course, in which we synthesized and purified a series of compounds, and were judged by purity and yield of the product.
We had to label the small glass stoppered bottles in which we submitted our products with among other things, the "tare weight" which was the weight of the bottle and label.
In commerce tare weight is the weight of the container.
From ancient times harvested grain contained weed seeds and stems. Many Bible quotations refer to the tares. Apparently there were enough tares in grain when it was sold, that the buyer had to esitmate the proportion of tares mixed with the grain, and lower his offer for the grain proportionately. Today some kinds of packages will state the "tare weight" meaning the weight of the container.

tare 1
n.
5ME, small seed, vetch < or akin to MDu tarwe, wheat < IE base *derwa3, kind of grain > Sans dNrva, millet grass: used in ME and Early ModE versions of N.T. to transl. LL(Ec) zizania, darnel6
1 any of several vetches, esp. the common vetch (Vicia sativa)
2 the seed of any of these plants
3 Bible a noxious weed thought to be darnel: Matt. 13:25-40

tare 2
n.
5LME < MFr < It tara, prob. < Ar ParaSa, to reject, throw, cast6
1 the weight of a container, wrapper, vehicle, etc. deducted from the total weight to determine the weight of the contents or load
2 the deduction of this
vt.
tared, tar4ing to find out, allow for, or mark the tare of

tare3 7ter8
vt., vi.
archaic or dial. pt. & pp. of TEAR1