Things You'll Need

Instructions

1

Obtain an amount of pure ethanol. This can be purchased from chemical supply companies or from a hardware store.
2

Measure the volume. In general, this information will be printed on the label of the ethanol. Otherwise, you will need to measure it yourself, using a graduated cylinder or flask.
3

Divide the volume of ethanol by ten. This is the amount of methanol you will need to add to make the ethanol "denatured."
4

Add this amount of methanol. Methanol can be purchased from chemical supply companies. It can be measured using a graduated cylinder or flask. Because the amount of methanol does not need to be exactly one-tenth of the total volume, this measurement does not need to be exact.