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Dehydrated agar must be mixed with water to dissolve. One re-hydrated package fills about 15-20 dishes. Mix 1 level teaspoon of dehydrated agar with 100 ml (3/8 cup) of water and then bring to a boil to make 100 ml of agar solution. Fill petri dishes to just cover the bottom. Typical 90-100mm dishes require 10-15 ml agar. Rotate the dish to obtain even surface coverage. Cover the dish immediately and let stand until firm. Store upside down in the refrigerator until ready to use. Treat every bacteria culture with great caution. Once the dishes are prepared with solidified agar, use a sterile cotton swab or inoculating needle (heat-sterilized and allowed to cool) and take a bacteria sample (One way is to swab the inside of your cheek). Very gently rub the swab over the agar in a few strokes and replace the lid to the dish. Allow the dish to sit in a warm, preferably damp area for 2-3 days. It's a good idea to record the growth each day with a drawing and written description To dispose of a bacteria culture, add 1 tablespoon household bleach, recover the dish, and seal in a plastic bag.

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