There’s nothing pretty about this.  A watchdog group tested more than 20 top-selling at-home hair dyes and found toxic chemicals across the board — including a substance classified as a probable human carcinogen that showed up in every single one. “Harmful chemicals have no place in our everyday products,” Oriene Shin, safety advocacy manager at Consumer Reports (CR), which conducted the deep-dive, said in a press release . “Not in the dyes adults use to cover their grays. Not in the chalk kids