Do not touch the sticks absorbing the liquid of aroma diffuser. Depending on the kind of liquid, the color of the sticks rarely runs, but there is not any problem for use. As the material is natural wood, there may be some color variation, nodes and/or splinters. Do not use or store within reach of children and pets. Do not use or store in a place subject to direct sunlight or high temperature. Keep away from fire and other sources of heat. Do not use this product for purposes other than its intended purposes.