WEBVTT

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Try this original punctuation question.

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The sample looked clear, blank, however, the sensor
detected impurities.

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Before choosing a mark, test the words on each side
of the blank.

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The sample looked clear can stand as a sentence.

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So can the sensor detected impurities.

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Both are independent clauses.

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However expresses contrast, but it does not join
clauses in the way that and or but does.

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A semicolon separates the two complete clauses.

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The comma already after however sets off that
transition.

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A comma alone would create a comma splice.

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No punctuation would fuse the clauses.

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A colon would promise an explanation of clarity, but
the second clause instead contrasts with it.

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Now change the beginning: Although the sample looked
clear, the sensor detected impurities.

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Although makes the first clause dependent, so an
introductory comma works.

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Do not apply the semicolon mechanically.

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Test the clauses again whenever the wording changes.