A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

Note: 
The expression does not correlate in meaning with its
formal French counterpart pied noir—used of people of French
origin living in Algeria during French rule: M. Fabre was an
elderly colon, one of the original French families in Algeria —
a pied noir, as they like to be called.
Blackfoot—
1
. people belonging to the Blackfoot Indian Con-
federacy: Among the Blackfoot, stealing an enemy’s weapons
was the highest exploit. 2. the language of the Algonquian
American Indians: A few detached languages in the west :
Blackfoot, Cheyenne, and Arapaho.
black market • gray market
black market—an illegal market in which goods or curren-
cies are bought and sold in violation of price controls, ra-
tioning, etc.: Drugs are sold at the black market and they can
do much more damage than cigarettes can in most cases.
Note: 
The expression is not antonymous in meaning to the
phrase white sale— a sale at reduced prices of goods such as towels,
linens, etc.: We went to the white sale at the department store
to buy some new sheets before my parents come to visit.
gray market—the retail business operating within the law
but selling goods, such as imports, at prices below those set
by an official agency: Also affected by the gray market activities
are highly technical products such as disc drives, computers,
computer chips.
black board
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black money • white money
black money —
1
. money not declared for tax purposes (by
casino operators, etc.): Erlich has also promised an amnesty
for those who reveal their black money and pay a tax on it. 2.
money paid to workman handling dirty materials or working
in dirty conditions: When any class of work involves special
unpleasantness, “black money” or “dirty money” is sometimes
stipulated for.
white money —(arch.) standard silver coins: Rutland pays to
the King one hundred and fifty pounds white money.
See also: pink money / red money.