| Practicing in front of a full-length mirror helps. Try to make sure your bow stays perpendicular to the string for its entire stroke; angle seems to degrade tone. Achieving this requires some suppleness in your wrist.
Also, make sure your bow hold isn't too tight. Bow pressure should be dictated by arm weight, not by torque created by index finger and thumb. This can cause the scratchy tone you're talking about.
I still play a lot of long-tone scales to keep the tone even. After 25 years, I'm getting there!
Of course, a few lessons with a qualified teacher will help a lot.
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