A432 Report post Posted May 15 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 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 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 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 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
