Perform this amazing experiment at home with MEL Science: https://melscience.com/en/experiments/seaweed/

Safety
* Put on protective gloves and eyewear.
* Conduct the experiment on the tray.

Disposal
* Dispose of solid waste together with household garbage.
* Pour solutions down the sink.
* Wash with an excess of water.

Step-by-step instructions
1. Prepare a potassium hexacyanoferrate(II) K₄[Fe(CN)₆] solution.
2. Put various metal salts into different areas of the bottom of the beaker.
3. Metal salts gradually dissolve and react with the potassium hexacyanoferrate(II). Insoluble copper, iron and zinc compounds form. These don’t just precipitate out but form “bubbles” because of the osmotic pressure. The fancy chemical seaweed grows from these bubbles.