Using the Chalk tool
The Chalk tool 
lets you create consistent, dry media over the course of a stroke. The pigment penetrates the canvas texture according to the pressure setting you choose. The Chalk tool does not have a bristle component to the stroke; instead, it is applied with a flat or angled edge that is affected by the texture of the canvas.
Chalk tool options
Chalk tool options include
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Shape — defines the shape of the chalk tip
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Size — defines the size of the tool head in pixels
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Thickness — defines the aspect ratio of the tool head
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Rotation — defines the angle of head rotation in degrees
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Head Tracking — defines whether the tool head bends around the path of the stroke, or whether it remains at a fixed angle
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Trace check box — allows the Chalk tool to select the pigment color by sampling the data below the center of the tool regardless of the layer type. (This feature works much the same way as the Clone Brush’s Sample Merged tool option).
Important! When you hold down the mouse button to begin the stroke, note that a single sample is performed and the resulting color is used for the duration of the stroke.