How to treat used oils
to make a perfect candle

Recycling vegetable oils is easy and quick

Learn how to treat, quickly and economically, used cooking oils or out-of date cosmetic oils:


After cooking with oil get rid of the impurities (water and bits of food) by using a coffee filter or a fine-mesh strainer. Keep the liquid in a jar with a tight-fitting top.


If the oil comes from canned preserves (tuna, for example), let it stand for 24 hours before filtering it so that the oil and water separate, forming two layers (watery on the bottom and oily on top). Only then should you filter and store the oil in a sealed jar.


If you do not follow these procedures, the candle’s burn and its scent could be harmed, with fungus possibly speeding up the wax’s decomposition.

Vegetable oils used to make candles

To make environmentally sustainable decorative candles at home, you can utilize the following oils, virgin or used, from cooking or cosmetics:

  • olive oil
  • nut oil
  • grape oil
  • soya oil
  • coconut oil
  • corn oil
  • rice oil
  • castor oil
  • hazelnut oil
  • guava oil
  • linseed oil
  • poppy seed oil
  • sunflower oil
  • sesame oil
  • cottonseed oil
  • óleo de abacate
  • óleo de amendoim
  • óleo de canola (colza)
  • óleo de amêndoas doces
  • óleo de conservas (atum, bacalhau, lulas…)

* If, even so, you still have questions about how to treat your used oils, consult our FAQs section or get in touch with us directly by phone or email.