Plastic Petri Dishes

Petri dishes can culture molds or bacteria or act as a small enclosed environment for insects and plant seedlings or even as a display case. These petri dishes are made from clear polystyrene and are sterilized.

We do not supply agar but baking supply stores often sell it in bulk. You can prepare basic culture media as follows:
 

• 0.5% powdered milk or whey protein concentrate
• 0.3% beef extract (beef bouillon cubes)
• 1.5% agar

% means weight by volume. So if you have 1 litre of water (1000g), add 5g of powdered milk, 3g of beef extract (or ~1/5 a bouillon cube) and 15g of agar. Mix & heat in a pressure cooker to sterilize, then pour into the petri dish, close the lid & let cool down.