Get a piece of fresh liver or heart, from a butcher, and get microbiology to inocculate by injection with the culture of gram +ve and -ve.  Grow the bugs on for a couple of days then fix and process etc.

Best Wishes

Steve Machin UK

  "Scott, Allison D" <Allison_Scott@hchd.tmc.edu> wrote:

Does anyone have the procedure for making your own gram controls. I have
totally lost mine. Thanks in advance.
Allison Scott