Carolina 3M Petrifilm Aerobic Count Plates - Manual (Page 5)

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5. Hold the spreader with the circular ridge down (flat side up). Place the
spreader on the top film over the inoculum (fig. 5).
Figure 5
6. Gently apply pressure on the spreader to distribute the inoculum over
a circular area. Do not twist or slide the spreader (fig. 6).
Figure 6
7. Lift the spreader. Wait at least one minute for the gel to solidify (fig. 7).
Figure 7