Brighten Color Flame Candles have passed the test by Consumer Testing Laboratories, Inc' in U.S.A. as well as the test by SGS Hong Kong Ltd. We have received the SGS Test Report(2010007/SD) and EN71 Test Report(2017091/SD) and the CE Certificate which has proved our product is not harmful to health and environmental friendly. There is No Smoke. No Tears. No Ashes and No Odor while burning. And they can be lighted up indoor or outdoor.