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That is difficult to graph because you use a graph to show the relationship of numerical data. You will need to define what 'clean' is by using measurements.

You could say that the cleaning results in an improvement in reflection. You would measure that change using a photographer's light meter to measure the reflection off the pennies, before and after, from a standard light source.

You would then set the Time in the cleaning solution on the X-axis and the change in reflectiveness on the Y-axis.

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14y ago

What else can I help you with?