The Essay

Positive Control is a procedure that is very similar to the actual experimental test

but which is known from previous experience to give a positive result. A negative control is known

to give a negative result. The positive control confirms that the basic conditions of the experiment were

able to produce a positive result, even if none of the actual experimental samples produce a positive result.

The negative control demonstrates the base-line result obtained when a test does not produce a measurable

positive result; often the value of the negative control is treated as a "background" value to be subtracted

from the test sample results. Sometimes the positive control takes the quadrant of a standard curve.

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