With the development of Lapis rosin I started to test the gemstone as additions to the rosin. In this way, more experiments with additions of rock crystal, aquamarine and tourmaline have arisen.

These rosins have a very fine quality, which lead the sound experience into the range of the singing. I now offer this test pieces for testing in as part of the test kits, such as those offered in the shop:

  • For Violin and Viola: rock crystal and tourmaline.
  • For Cello: aquamarine and tourmaline.
  • For Double bass: Lapis V and Lapis VI