Two methods of oil quality identification include observing the color and transparency of oil, smelling the fragrance of oil and testing the viscosity of oil.

1. Observe the color and transparency of the oil: high-quality wormwood oil and ginger oil have bright colors, high transparency and no impurities and sediments.

2, smell the aroma of oil: high-quality wormwood oil and ginger oil should have a strong herbal aroma, no pungent smell.

3. Test the viscosity of the oil: drop a drop of wormwood oil or ginger oil on the back of your hand and gently rub it. High-quality oil should have a certain viscosity and not flow easily.