How can i improve my science investigatory project, "stamp pad ink from used motor oil"?

i have that topic approved by the teacher but he said that its an old project and so i need to find a way to improve it....

Answer:
Here's a few suggestions:

1) mix spent hydraulic fluid/transmission fluid for different colors
2) add food dyes for different colors.
3) use old spent air filters as the absorbent pads to for the stamper.

4) use a hydraulic/oil mixture (experiment) to improve ink drying time.
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