The speed of pressure variation refers to how quickly or slowly the pressure changes during writing. Pressure changes that are too rapid can result in uneven writing, while pressure changes that are too slow can lead to quicker hand fatigue and interruptions in writing flow.
The prerequisite for this is the ability to control pressure appropriately. The child must first experience what it means to apply more or less force, allowing them to quickly and effortlessly reproduce these intermediate stages.
The color describes the pressure levels. Red = strong pressure Blue = weak pressure