Date rape nail polish
The nail polish changes color when exposed to a variety of...chemicals.
http://www.newsweek.com/controversy-over-nail-varnish-date-rape-drug-detector-267126
However, the invention has detractors:
“Whilst Undercover Color’s initiative is well meaning, on the whole,” she said, “Rape Crisis does not endorse or promote such a product or anything similar. This is for three reasons: it implies that it’s the woman’s fault and assumes responsibility on her behalf, and detracts from the real issues that arise from sexual violence.”
I dont see how this is bad, personally. I certainly dont see it as putting women in a negative light.