Whitewashing is a traditional method used to give walls a smooth, bright, and clean white coating. It is commonly used in homes, farms, temples, trees, and old buildings. The effectiveness of whitewash depends heavily on the type of lime used.
The lime used in whitewash is Quick Lime (Calcium Oxide – CaO).
Quick lime is mixed with water to prepare slaked lime (Calcium Hydroxide), which becomes the main ingredient of whitewash.
This slaked lime creates a smooth, bright white coating that sticks well to walls and provides natural antibacterial protection.
When applied, it absorbs COâ‚‚ from the air and becomes calcium carbonate, creating a hard white finish.
| Lime Type | Scientific Name | Used in Whitewash? | Notes |
|---|---|---|---|
| Quick Lime (Correct) | Calcium Oxide (CaO) | ✔ Yes | Main lime used; reacts with water to make slaked lime |
| Slaked Lime (Whitewash Lime) | Calcium Hydroxide (Ca(OH)₂) | ✔ Yes | Form that is actually applied on walls |
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Quick Lime (Calcium Oxide – CaO), slaked into Calcium Hydroxide
Yes — if it is high-purity whitewash-grade hydrated lime.
It turns into calcium carbonate when exposed to air, giving a natural shine.
Yes — lime is natural, antibacterial, and eco-friendly.
Yes — especially in kitchens, village homes, and old-style buildings.
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