You have to bleach even with blonde hair. There is no direct return to a natural blonde hair colour in case of emergency. in my case I had to go darker (I chose a deep red) to cover after 3 hours in hair salon, then let that grow out from pixie to pixie to get back to natural. That's OK when you're 22. Not sure I'd recommend in corporate environment.

I've adopted power hair and heels, works wonders for credibility. Would hate for you to jeopardize yours, it's hard to come by. Suggest clip on.