The borax method works because its solubility increases dramatically with temperature. As the water cools, it can no longer hold all the borax molecules, forcing them to precipitate onto any available surface – especially rough fibers. Salt and sugar have flatter solubility curves, requiring water evaporation instead of cooling, which is why they take longer.
| Crystal type | Time to first visible growth | Final size (24h) | Fragility | Notes | |--------------|------------------------------|------------------|-----------|-------| | Borax | 2–4 hours | 2–5 cm cluster | Brittle | Overnight success | | Table salt | 2–3 days | 1–2 mm cubes | Hard | Needs slower evaporation | | Sugar | 3–5 days | 1–3 mm grains | Hard, sticky | Edible (rock candy) | diy crystals
The Ultimate Guide to DIY Crystals: How to Grow Your Own Gems at Home The borax method works because its solubility increases