Weight.

As I said a few days back, this is often seen as how hard you press the bow against the string, and that's not quite the right way to look at it.

Don't press the bow against the string with your fingers.  Allow the weight of your entire arm to be the force which presses the bow against the string.  That way it allows your fingers and your wrist to stay relaxed, which makes complicate bowings much easier.

This is not a concept that is easy to grasp for young students.  The key to look for is the relaxed hand throughout the time that the bow is being drawn.
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As your bow moves closer to the bridge you will need to add more weight in your arm to maintain a clean tone, and vice versa.  The further away from the bridge the less weight you need for that sound (to a point). 
The key today, though, is to keep that wrist, those fingers and that forearm relaxed as you play.

Experiment with these 3 elements of sound production that we have discussed the last several days and you will see that when you stick to the rules you can make a beautiful tone in any dynamic.
Violin Tip of the Day - March 23
* Violin Tips for Practice and Rehearsals.

* Violin Technique and Exercises.

* How to Care for Your Violin.

* Inspiration and Motivation for Violinists, Fiddlers, or
   Anyone Interested in Stringed Instruments.
Violin Tip of the Day -- Violin Student Central -- February 1
Today's Tip in a Nutshell:
    
Sometimes Less is More. Use only the
     pressure that is necessary!!
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