Hidersine Reserve21 Rosin, HL-HR21V
HL-HR21V
Reserve21 is Hidersine's premium line, hand-blended and hand-cast in England. It uses Brazilian WW resins and British beeswax.
- 30 g on a hemmed microfibre cloth
- Violin light to medium-hard, cello dark to medium
Technical data
| Weight | 30 g |
| Included | Microfibre cloth |
| Country of manufacture | England |
Features
- Hand-blended and hand-cast in England
- Brazilian WW resins and British beeswax
In practice
- The cello version is deliberately darker and softer because the larger string diameter calls for more grip.
- The maker rates the grip at 7 out of 10.
- Apply sparingly. Players who re-rosin every session almost always use too much; for most, a few strokes every four to five playing hours is enough.
- After playing, wipe strings, top and bow stick with a soft dry cloth. That keeps the varnish free of dried-on deposit.
Versions
- Violin, HL-HR21V
- Cello, HL-HR21C
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.
Do the numbers on rosin always indicate hardness?
That differs from maker to maker. At Thomastik 1, 2 and 3 stand for soft, medium and hard, while Lapella calls its grades Solid, Medium and Soft. Hidersine names its double bass rosins DB1 and DB2 by temperature, for cold and for moderate weather.
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.
