Oxygen: Most commercial glazes are designed for use in an oxidizing environment (usually in an electric kiln.) Red, orange and yellow are particularly sensitive to the amount of oxygen in the air. All clay has carbon in it, much of which burns out in the early stages of firing. This creates carbon monoxide, which will affect the glaze if it hangs around. So you want plenty of air flow, to remove this carbon monoxide as quickly as possible.
If you fire with a vent, you should be getting enough oxygen in the kiln. If not, make sure the top lid is propped and peephole plugs are out for the first few hours. With manual venting it is best to put colors such as red on the top shelf where they will get more oxygen.

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