Chalk presents a dry media with infinite head loading, meaning the media
does not "run out" over the course of a stroke like it does
with the Oil Brush. As applied by the Chalk tool 
, its
dry pigment tends to penetrate the canvas texture proportional to the
pressure at which you apply it. This is due to Paint Shop Pro mimicking
a solid tool head, combined with the chalk having a fixed viscosity. Chalk
does not have a bristle component to the stroke, but is instead applied
via the tool's flat or angled surface. The stroke edges tend to have a
fall-off and break up affected strongly by the current canvas texture.
Chalk is a matte and powdery medium, so it doesn't tend to smear itself much, though it does sink in to the dents in the canvas. Because it is a hard pigment medium, chalk does not apply volume to the surface of the canvas.
Chalk tool options include:
Shape: Choices include Round or Square.
Size: Defines the size of the tool head in pixels. Note that you can also adjust the Size setting via the keyboard.
Thickness: Defines the aspect ratio of the tool head.
Rotation: Defines the angle of head rotation in degrees
Head Tracking: Controls whether the tool head bends around the path of the user’s stroke, or remains at a fixed angle.
Trace check box: When marked, the Chalk tool will 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 the Clone Brush's Sample Merged tool option works). 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.
Like other Paint Shop Pro tools, the Chalk tool comes with presets. To use a preset:
In the Tool Options palette, click the Presets button. This displays a list of preset styles.
From the list, choose the desired tool preset.