Examine your slides under the microscope with the
100X oil immersion bright field objective:

1. Focus on the area of the stain with 10X objective - you will not be able to see individual bacteria.
2. Swing 10X out of the way and place a drop of oil directly on to the stained area - no coverslip.
3. Swing in the 100X bright field objective and rack down into the drop of oil.
4. Focus.

Click on the slides to examine them: