A432 Report post Posted May 15, 2019 Quote Dichroism needs a molecular thin layer to produce an angle-dependent optical wave interference pattern of colors. The constructive/destructive wave interference produces colors. Oil films on water are the best example. Varnish layers are orders of magnitude too thick for dichroic effects. Quote https://www.gemselect.com/other-info/pleochroic-gems.php One of the intriguing properties of many gemstones is an optical phenomenon called pleochroism. It refers to gems that appear to have different colors or depth of color when viewed from different angles. Pleochroism is caused by differing absorption of light rays in doubly refractive crystals . . . Some pleochroic gems are said to be dichroic - displaying two different colors; kunzite is an example. FWIW Quote Share this post Link to post Share on other sites
FoxMitchell Report post Posted May 16, 2019 On 5/10/2019 at 1:23 PM, joerobson said: That's surreal! Could pass as modern art! Quote Share this post Link to post Share on other sites
joerobson Report post Posted May 29, 2019 Many shades of the Stradivari Cochineal Varnish as executed by Texas violin maker Alkis Rappas. Quote Share this post Link to post Share on other sites
Michael Szyper Report post Posted May 29, 2019 Holy sh... Joe your varnish is incredible! Is there some brown added or is it all the cochineal? Quote Share this post Link to post Share on other sites
joerobson Report post Posted May 29, 2019 2 hours ago, Michael Szyper said: Holy sh... Joe your varnish is incredible! Is there some brown added or is it all the cochineal? Thanks Michael. These are all just the Stradivari Cochineal and Base Varnishes in differing applications. Nothing else added. on we go, Joe Quote Share this post Link to post Share on other sites
joerobson Report post Posted December 25, 2019 Hello all, Our trade is full of repetitive tasks. Repetitive tasks can become traditions and rituals. One of my traditions is this book: The Nature and Art of Workmanship by David Pye. For the past 10 years my preparation for varnish workshops has begun with re-reading this book. So my prep has begun again.I will have 2 workshops this year:Practical & Artistic Violin Varnishing held April 25th – May 2nd at theChicago School of Violin Making. This workshop is co-taught with Marilyn Wallin and Todd Goldenberg. Fundamentals of Oil Varnishing held March 1st – March 6th at Learning Trade Secrets in Ashland, Ohio., which I teach myself. For information on either please contact me at order@violinvarnish.com Quote Share this post Link to post Share on other sites
