We use a DAKO Autostainer and DAB as a chromagen.  We have been seeing a
brown haze all over the slides all the way up to the slide labels.  We have
been seeing a lot of DAB collecting in the sink of the machine as well DAKO
tells us that they don't know what is happening.  It doesn't seem to be a
messed up lot of DAB and we assayed our buffer to make sure that it had zero
protein content.  Anyone have any ideas as to what this might be?

Angela Cook
Children's