@sueinmn Hi Sue, I use good quality oil paints that are basically pigment mixed with oil and I use linseed oil to thin and clean. . I paint on wood. Basically the same materials as used in the Renaissance. No turpentine, no terpenoid, no mediums, and I use unscented dish soap to clean my brushes. (Murphy oil might be ok but I haven't tried it. If your friend modifies her materials she might be ok. I also ask a friend to put the final glaze on outdoors and it all works out well. I do think the work related chemicals like methylmethacrylate and powerful sterilizing cleaners may have contributed to this misery but genetics didn't help and my doctor thinks there may be a viral link. I think encouraging the use of hepafilters in work places may help prevent this for other people