A432 Posted May 15, 2019 Report Share 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 Link to comment Share on other sites More sharing options...
FoxMitchell Posted May 16, 2019 Report Share Posted May 16, 2019 On 5/10/2019 at 1:23 PM, joerobson said: That's surreal! Could pass as modern art! Quote Link to comment Share on other sites More sharing options...
joerobson Posted May 29, 2019 Author Report Share Posted May 29, 2019 Many shades of the Stradivari Cochineal Varnish as executed by Texas violin maker Alkis Rappas. Quote Link to comment Share on other sites More sharing options...
Michael Szyper Posted May 29, 2019 Report Share Posted May 29, 2019 Holy sh... Joe your varnish is incredible! Is there some brown added or is it all the cochineal? Quote Link to comment Share on other sites More sharing options...
joerobson Posted May 29, 2019 Author Report Share 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 Link to comment Share on other sites More sharing options...
joerobson Posted December 25, 2019 Author Report Share 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 Link to comment Share on other sites More sharing options...
joerobson Posted February 15, 2020 Author Report Share Posted February 15, 2020 Registration for the varnish workshop at Learning Trade Secrets closes on Monday evening. If you have any questions give me a call at 607 387 9280. https://www.learningtradesecrets.com/workshops/fundamentals-oil-varnishing on we go, Joe Quote Link to comment Share on other sites More sharing options...
joerobson Posted May 5, 2020 Author Report Share Posted May 5, 2020 My current project. "Practical & Artistic Violin Varnishing" is ...hopefully...re-scheduled for August 15th - 22nd at the Chicago School of Violin Making. Contact me for details. on we go, Joe Quote Link to comment Share on other sites More sharing options...
Ken_N Posted May 10, 2020 Report Share Posted May 10, 2020 Now THAT is what I like Joe. I'm a straight up varnish guy, the worn look does NOTHING for me, and that is a great look. What are you using to get that color? My last one, the 5 string, finally came out nice; I needed WAY more prep work; probably even a better ground coat; it's transparent, with some color shift; but not much color. Quote Link to comment Share on other sites More sharing options...
joerobson Posted May 10, 2020 Author Report Share Posted May 10, 2020 1 hour ago, Ken_N said: Now THAT is what I like Joe. I'm a straight up varnish guy, the worn look does NOTHING for me, and that is a great look. What are you using to get that color? My last one, the 5 string, finally came out nice; I needed WAY more prep work; probably even a better ground coat; it's transparent, with some color shift; but not much color. Thanks Ken. The sequence is Balsam Ground with Aged Wood Gold, strong separation coat of Stradivari Base Varnish, thin application of Stradivari Cochineal Varnish....no pigments. on we go, Joe Quote Link to comment Share on other sites More sharing options...
Ken_N Posted May 14, 2020 Report Share Posted May 14, 2020 Joe, What do you use for filling? The one I'm doing now is Walnut, and it has holes, so it needs it. I always have a lot of texture on the belly, even the latest one I varnished, after wetting, and scraping smooth for weeks. This older one (that looks cooler in person than it does in the photo that amplifies everything that you don't really see in person), gives an idea of how bad it can be. I don't know if the varnish sinks in, or what. Does the Balsam Ground take care of that somewhat? Quote Link to comment Share on other sites More sharing options...
joerobson Posted May 14, 2020 Author Report Share Posted May 14, 2020 1 hour ago, Ken_N said: Joe, What do you use for filling? The one I'm doing now is Walnut, and it has holes, so it needs it. I always have a lot of texture on the belly, even the latest one I varnished, after wetting, and scraping smooth for weeks. This older one (that looks cooler in person than it does in the photo that amplifies everything that you don't really see in person), gives an idea of how bad it can be. I don't know if the varnish sinks in, or what. Does the Balsam Ground take care of that somewhat? Ken, My preference is towards a lot of wood texture but minimal varnish texture. I seal the wood but don't fill the pores. I would need some information on what you did on the top before I could make an opinion. on we go, Joe Quote Link to comment Share on other sites More sharing options...
Ken_N Posted May 14, 2020 Report Share Posted May 14, 2020 Well, it is just wood.texture. The wood was curly bearclaw. I like it, but I haven't seen many with it. It was done 6 years ago, and I was worse then than I am now about notes. So I have no idea what's under the.varnish. It would probably help to do things the same way. I do know that I varnish when it just starts to feel like the next coat will cover it and not sink in. Quote Link to comment Share on other sites More sharing options...
joerobson Posted May 14, 2020 Author Report Share Posted May 14, 2020 31 minutes ago, Ken_N said: Well, it is just wood.texture. The wood was curly bearclaw. I like it, but I haven't seen many with it. It was done 6 years ago, and I was worse then than I am now about notes. So I have no idea what's under the.varnish. It would probably help to do things the same way. I do know that I varnish when it just starts to feel like the next coat will cover it and not sink in. Ken, Was the color in the varnish tube colors? Joe Quote Link to comment Share on other sites More sharing options...
Ken_N Posted May 15, 2020 Report Share Posted May 15, 2020 The color on that is Greek Pitch Maroon over probably one coat of some varnish I made that looks dark, but is just a light amber, like this: The original color was like the small photo, but it darkened, and the varnish was never polished up. I polished it last summer. It shows the flame nicely now, but it didn't help my edge work back then that was even worse than my work today. I really don't see that except in photos. Why is that? Yes, I know; bad eyes. I guess I should have smoothed up the base coat, and probably added another, and then put on the color coat. How long does it take before you can polish? I was in a hurry when I did that one. Now I have nothing but time! What did I do to the color? My latest has a few spots with tiny bubbles. I don't use any solvents, so what could that be from? Most of it is smooth, and I never noticed them until today, several months later. The walnut one is finally getting glued up, and it will look cool, so I don't want to mess it up. Quote Link to comment Share on other sites More sharing options...
Ken_N Posted May 16, 2020 Report Share Posted May 16, 2020 Well Joe, the best I can remember is that I varnished a viola with the Maroon first. It came out red. But for that other one, I wanted more of a Venetian red. So I think I put some blue-green watercolor in the ground to shade it down. I don't remember putting anything else in the color coats. It is possible that I thinned it some with a less viscous varnish, and something in that changed the color. Those darn kids; you never know what they're going to do. This is the Viola 6 years later, It isn't hideous: Quote Link to comment Share on other sites More sharing options...
joerobson Posted January 21, 2021 Author Report Share Posted January 21, 2021 When the color is right and the halos are in place, I think I'm ready for varnishing. Quote Link to comment Share on other sites More sharing options...
Jim Bress Posted January 21, 2021 Report Share Posted January 21, 2021 Joe what do you mean by “when the halos are in place “? Quote Link to comment Share on other sites More sharing options...
MikeC Posted January 21, 2021 Report Share Posted January 21, 2021 yeah what halos? And Joe what would you suggest to darken the inside of a violin prior to closing it up so you don't have stark white wood shining out through the F holes? Do you have a stain or product for that purpose? Quote Link to comment Share on other sites More sharing options...
joerobson Posted January 22, 2021 Author Report Share Posted January 22, 2021 14 hours ago, Jim Bress said: Joe what do you mean by “when the halos are in place “? As observed in the Cremonese Ground...in both optical phases each stripe is illuminated...a dark streak in the middle sloping on each side through orange and yellow to nearly white. Quote Link to comment Share on other sites More sharing options...
joerobson Posted January 22, 2021 Author Report Share Posted January 22, 2021 13 hours ago, MikeC said: yeah what halos? And Joe what would you suggest to darken the inside of a violin prior to closing it up so you don't have stark white wood shining out through the F holes? Do you have a stain or product for that purpose? Yes. Aged Wood Color Gray Green. Quote Link to comment Share on other sites More sharing options...
MikeC Posted January 22, 2021 Report Share Posted January 22, 2021 59 minutes ago, joerobson said: Yes. Aged Wood Color Gray Green. Thanks, do you have a picture of what it looks like on wood? Also I see you have a product called Linox, what exactly is that? Quote Link to comment Share on other sites More sharing options...
Jim Bress Posted January 22, 2021 Report Share Posted January 22, 2021 1 hour ago, joerobson said: As observed in the Cremonese Ground...in both optical phases each stripe is illuminated...a dark streak in the middle sloping on each side through orange and yellow to nearly white. Thanks Joe. That's new information for me. Quote Link to comment Share on other sites More sharing options...
Don Noon Posted January 22, 2021 Report Share Posted January 22, 2021 2 hours ago, joerobson said: As observed in the Cremonese Ground...in both optical phases each stripe is illuminated...a dark streak in the middle sloping on each side through orange and yellow to nearly white. (Trick photo... but the only post-processing was to adjust the exposure a bit darker...) Quote Link to comment Share on other sites More sharing options...
joerobson Posted January 22, 2021 Author Report Share Posted January 22, 2021 1 hour ago, Don Noon said: (Trick photo... but the only post-processing was to adjust the exposure a bit darker...) Don, The is the effect that is illuminated by the ground. Nice photo. on we go, Joe Quote Link to comment Share on other sites More sharing options...
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