Was quoting (always hazardous) popular literature on XTOL toxicity. Kodak makes MSDS (material safety data sheets) available for all their products on their website: search on MSDS. The sheet for XTOL seems to list fewer problem spots than others, but I was surprised to note that although METOL is absent from the formulation as far as I can tell, ascorbic acid (vitamin-C) which is touted popularly to be the active ingredient seems not present. But chemistry is not my strong point.