Grow Blue-Green Copper Acetate Crystals

Copper Acetate Crystals

Copper Acetate Crystals (Choba Poncho, public domain)

It’s easy to grow large naturally blue-green monoclinic crystals of copper acetate monohydrate [Cu(CH3COO)2┬ĚH2O].


  • copper acetate monohydrate
  • hot water
  • acetic acid or vinegar (if necessary)


  1. Dissolve 20 grams of copper acetate monohydrate in 200 ml of hot water. If you don’t have a scale, don’t despair. Dissolve the copper acetate in warm water to create a saturated solution. You’ll know you have enough of the powder added when it stops dissolving in the liquid.
  2. If you see a scum of undissolved material, stir in a couple of drops of acetic acid (vinegar).
  3. Place the container in an undisturbed location to allow crystal to grow.
  4. Blue-green crystals should start to appear within a couple of days. You can allow them to grow on their own or can you can select one perfect crystal to use as a seed crystal to grow larger crystals.
  5. If you wish to grow a large single crystal, place the seed crystal in a new container and add the copper acetate solution from the old container.
  6. When you are pleased with the crystal, remove it and place it on a paper towel to dry.

You can also grow copper acetate crystals using a penny:

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