Thomastik Vision Viola Rosin KVI002, ST-KVI002-ROSIN (Box of 10)
ST-KVI002-ROSIN
The Thomastik Rosin KVI002 is a variant of the new Thomastik-Infeld rosin line for viola.
- Rosin ages; if the surface turns glassy, roughening it lightly helps
- Like the KVI001, it is based on a carefully assembled blend of natural resins and waxes from five continents.
- The protective silicone cap keeps the resin fresh.
Technical data
| Line | Rosin KVI/KPI |
| Instrument | Viola |
| Item number | ST-KVI002-ROSIN |
Description
Crafted in Vienna by Thomastik-Infeld.
Sound and physics
Rosin (the residue left when turpentine is distilled from conifer resin) raises the static friction (the friction between two surfaces that are not yet sliding against each other) on the bow hair. The bow therefore carries the string along until the string's restoring force prevails; the string then slides back and grips once more.
The difference between static and sliding friction, to which rosin contributes, helps set the minimum and maximum bow force (the pressure of the bow on the string) between which a steady note forms. Within this range the string breaks away exactly once per vibration (Helmholtz motion), and the tone contains the complete series of harmonics (the whole-number multiples of the fundamental).
Frequently asked questions
Why does a bow need rosin?
Rosin raises the static friction between bow hair and string. The bow only carries the string for as long as that friction exceeds the string's restoring force, and the bowed tone grows from this alternation of gripping and sliding.
Where does the name colophony come from?
From the city of Colophon in Asia Minor. Colophony, or rosin, is the residue from distilling turpentine out of conifer resin.