How to Grow a Perfect Copper Acetate Crystal with Scrap Copper & Vinegar

When you wash old copper pennies with vinegar, the pennies react with the vinegar to form a blue compound called copper (II) acetate. Now, if you let that vinegar dry, small, black crystals will be left behind in the dish. Those are copper acetate crystals. It turns out you can grow much bigger copper acetate … Continue reading How to Grow a Perfect Copper Acetate Crystal with Scrap Copper & Vinegar