VIOLIN: ROSIN?

ROSIN IS BASICALLY DRIED TREE SAP:

ROSIN IS APPLIED ON TO THE BOW HAIR TO KEEP THE HAIR FROM SLIDING OFF THE STRING

http://www.simplyviolin.com/page2/page10/files/9f2a4c20a303825219b367d5d825a754-15.html

http://ezinearticles.com/?A-Violinists-Guide-to-Choosing-Rosin-For-the-Bow&id=2197203
http://www.violinonline.com/rosinandsound.htm
http://www.ruryviolin.com/pdfs/RosinTips.pdf
http://www.metacafe.com/watch/3820107/how_to_choose_a_type_of_rosin/
http://www.youtube.com/watch?v=40lt8lPuvuU
http://www.ehow.co.uk/video_2375281_applying-rosin-violin-bow.html

http://www.stringsmagazine.com/article/default.aspx?articleid=23756