I'm mostly concerned with pinpointing a possible poison so that I can portray believable symptoms. I also need for another character to be able to touch the character wearing the poisoned dress without absorbing so much that he dies himself. He can be affected and even become moderately ill, but I need him in functioning order. I would also prefer that the symptoms not be too horrifying, but I can work around that.
I've Googled variations of "poisons absorbed through skin", "poisons readily absorbed through skin", read the Wikipedia entry on poisons and the entries on arsenic, cyanide, cadmium, and mercury, and Googled for the symptoms of all those terms as well. I've also gone over the entries under the "poisons" and "poisoning" tags. Thanks in advance for providing me with the means to an intense conclusion.