I hadn't been on Feingold.org yet, but I will certainly check them out in my searches.Skin contact with artificial colours can cause tons of reactions, so many people seek uncoloured liquid soaps and products and ESPECIALLY toothpaste, because absorption of colour through the thin skin of the mouth is so quick.
Fragrance reactions can be extreme and you don't always know that you're reacting to the fragrance, if it's not a headache/asthma reaction. Some people have anxiety reactions and others have anger. I once knew a kid who would melt down due to cinnamon fragrances...his parents just stopped taking him shopping between September and January ;-)
@plantiest , check out Feingold.org if you don't already know about them, for a community that desperately seeks unscented/uncoloured products.
Also, for those who say "I never notice scents transferring" it's likely because you're not sensitive enough to. Once you go scent-free for a while, fragrances around you become much more obvious. So if you live scent-free, you *notice* when something's been contaminated.
I have to agree with you about scent contamination. Most people's noses go dead to it rather quickly. I had a friend who started using 'unscented' detergent (which uses a masking scent). She didn't understand why I was still reacting to her detergent. Then she went on vacation for a couple of weeks with her inlaws. They used fragrance-free detergent, which she then used for two weeks. When she got home, she opened up her drawer (that had laundry in it with the masking scents), and it struck her strongly. She had to get away from it before she could smell it again.
I have amazing, canary-like radar to scent chemicals. Blessing and a curse, I guess.