Picture too light:

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CAUSE: Too much Light.

Set the Light - Dark control to a lesser number. For color films, start with the Light - Dark control set at 13.
Pressing Boost before taking the picture will also over expose a picture if no boost is needed.
Boost is normally used to increase the light just for the next picture.
Instant films are sensitive to heat. If the film is very warm, it requires less light.
Try to use film at room temperature for consistent results.
The directions included with the film give suggested compensation guides for film at various temperatures.
The development time also changes based on the film temperature.