You can recognize the origin of the resin by its color.
French and North American pure resin has a light yellow color while
German pure resin is rather brown. Pure natural resin is transparent,
can be easily pulverized and dissolves in alcohol and essential oils.
In a successive stage, the pure resin is heated up again
while oil and other materials are added. This liquid will then be poured
into a mold to form the cake of rosin that

musicians are using for their bow hair. Each manufacturer
has his very own specific procedure to make rosin which he protects as
a strict secret. As a consequence, all rosins today differ in quality
and impact the bowing technique and the sound color of an instrument
immensely. For the musician it is thus important to carefully choose a
rosin which helps him to have the most ideal grip of the bow while
playing the strings.

High quality rosin allows for perfect bowing without
scratchy sounds, especially if only a thin layer of rosin is applied.
The general rule is:

• violinists and violists use a harder, dryer rosin

• cellists use a medium strong rosin

• bassists a softer rosin 

Another important aspect for choosing the right rosin is the core material of the string that are being used:

• steel strings are easier played if you use a hard, dry rosin

• for synthetic, gut and gut wound strings use a softer rosin

Moreover, experienced players prefer softer rosin when
playing in a studio and harder rosin in a concert hall. Hard rosin works
best in tropical climates while soft rosin is good for cold climates.

We develop our own specific rosin and design it according
the technical requirements of our different string lines. That is also
the reason why we name our rosin after the brand names of our violin and
viola string lines.