Bonnie
By definition dye is a chemical and believe it or not water is a chemical. In fact there is a prestigous award called the Perkin Medal that was founded on a Mauve dye (Perkin's), which is given annually to high powered chemists. Pehaps it would be better to ask are there any toxic chemicals, but again this is relative statement with no basis. For example did you know the bean sprouts in a vegemite sandwich has more carcinogens than a burger on the grill coated with benzopyrene! While there are true hazards with the wrongful use of chemicals they are not bad things, but rather the abuse or improper use are harmful.
Sorry for the soapbox, but I hate it when one refers to chemicals in a negative connotation, in fact your cultured stone, or Corian counters are based on chemicals! Glass has a chemical composition as does everyhting in this world! Look around you and everything in your house, car and environment has some chemical composition.
Gary