Thomastik Bratsche Kolophonium KPI001

Thomastik Peter Infeld Violin Rosin KPI001, ST-KPI001-ROSIN

ST-KPI001-ROSIN

The Thomastik Rosin KPI001 belongs to the new generation of Thomastik-Infeld bow resins and is intended for the violin.

  • Rosin ages; if the surface turns glassy, roughening it lightly helps
  • The exclusive blend of resins and waxes from five continents is tuned to the requirements of violin strings.
  • It comes with a protective silicone cap.
€195,00 €146,30 Save 25%
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Tax included.

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Thomastik Bratsche Kolophonium KPI001

Technical data

LineRosin KVI/KPI
InstrumentViolin
Item numberST-KPI001-ROSIN

Description

Made 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.

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