# 25 Shaker, I don't know - I think the power to say no is pretty strengthening. I don't think it diminishes anyone to understand that certain chemicals affect some people more than others and it is better to walk away. We don't think any worse of diabetics for avoiding sugar or coeliacs for avoiding wheat. I'm allergic to formaldehyde so it means (among myriad other things) avoiding normal hair dye, even though I'd much rather colour it it's not worth the trouble afterwards. In a sense it's quite empowering to know what one's problem is and tell it to bugger off.