1. This product is safe and environmentally friendly, non-toxic and harmless. 2. The sparking is mild and non-invasive, the hand can touch, will not burn clothes. 3. Special light machine supplies compound titanium powder need to be purchased separately. 4. Each use of the machine after the machine please clean up the residual material in the special effect machine to prevent clogging the machine. 5.Any request please email to: support@uking-online.com