Hand Saw Square cut, Step 3

Now make kerf cuts on each line about 1/16th to 1/8th inch deep. Slowly work the saw on the waste side of the razor line and slowly develop the kerf along the razor line. The razor line cuts the outer fibers to give you a clean line when you use your hand saw. Use your finger to guide the saw blade as you make the kerf. Crosscut saws(all hand saws) will have a bow to them to one side, but you can still guide the saw to stay along your straight razor line.