I'm working on an optical method for detection of low levels of fungal infection in human blood. It would make things easier if I could render the blood relatively transparent (even if I have to dilute it somewhat). I've tried lysing the red blood with distilled water, which lyses red blood cells and has little effect on fungal cells, but doesn't really clear the blood all that much. I'm assuming that the hemoglobin is now in solution and still leaves the blood sample relatively opaque. Any suggestions?