Bamboo Turning Black with Outdoor Use
Hi, we are doing a project using bamboo as facade under intense sun and rain in summer (subtropical climate). We did the boric borax solution treatment beforehand already, however under the rain season, some selective bamboos are blackened intensely, why is that and what other solutions/ treatments can prevent such situation from happening?
⭐ Best Answer:
The blackening you see is almost certainly fungal staining due to high humidity + rain exposure, since boric–borax doesn’t protect against that.
What to do:
Start by cleaning off the surface mold (use mild vinegar solution or lemon oil), then let the bamboo dry thoroughly. Next, apply a UV-resistant sealer, which protects against moisture and UV damage. To prevent recurrence, it’s recommended to re-apply every 1-2 years to maintain protection.
