INDIGOTIN (C) R Marsh & P May INDIGOTIN (C) R Marsh & P May INDIGOTIN (C) R Marsh & P May http://www.chm.bris.ac.uk/motm/indigotin/indigotinh.htm INDIGOTIN (C) R Marsh & P May indigotin INDIGOTIN (C) R Marsh & P May