Black drop or blackdrop may refer to: Black drop effect, an optical phenomenon visible during a transit of Venus Laudanum Kendal Black Drop, names sometimes used…
Black drop or blackdrop may refer to:
Black drop effect, an optical phenomenon visible during a transit of Venus Laudanum Kendal Black Drop, names sometimes used for a 19th century medicine made with opium Pitch drop experiment, demonstration of the time that it takes for a drop of pitch to fall
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