- plastic cup
- white cotton fabric
- rubber band
- sharpies (all different colors)
- rubbing alcohol
- eye dropper
Then took turns dripping rubbing alcohol onto the fabric with an eye dropper.
It was cool to see the colors from the ink spread out through the fabric. We noticed that some inks spread better than others, namely the yellows and the blues.
Lessons my son learned by doing this:
- Sharpies are called "permanent" markers because they are water- "insoluble", which means water will not dissolve the ink or make it bleed.
- Sharpie ink, however, is "soluble" in rubbing alcohol aka - it will dissolve in rubbing alcohol.
- Solvent is the substance that dissolves the ink...in this case, rubbing alcohol is the solvent, however, in many cases water can be the solvent, like with watercolors.