Daniel P.N

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About Daniel P.N

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  1. In this case, can we say this is a highly concentraded cochineal rosinate?
  2. Yes, yet another blindfolded violin comparison. Warning, before watching you should know: Its not scientific Its not trying to prove anything Its very well humored So it may not be for you I enjoyed a lot seeing the players conclusion, and I hope some of you guys will enjoy it also:
  3. Hey jmssartori, I had very good results with the 1704 varnish recipe using the floc shellac available in stores in sao paulo with the common 92 alcool. (sorry i just remembered that it was 99% that i bought at the quemical supplier, not the common stuff) BUT, make sure it is real shellac, some stores sells something they say its shellac and it looks like shellac, but is very cheap, that thing is not shellac and will not work. Funny thing is I have seen this cheap thing been sold with the name "cockroach wings varnish". Also maybe your alcool is bad quality, more water on it then it says, wich could explain lack of translucency and problems to dissolve the resins. I also had good results with oil varnish using the brazilian rosin and artist grade linseed oil, but thats another thing.
  4. I was asking for a link of the podcast at spotfy or youtube, like most people I dont use itunes. I found out the website and I will listen from there: https://www.omopod.com/
  5. Great! But I cant find it on Spotify, and I only found another non related "omo podcast" on youtube, do you have links for us non apple people? Maybe its country restricted?
  6. Have you seen this http://www.makingtheviolin.com/ ?
  7. Beautiful pic Conor! Whas he talking about Mandelbrot? There is a whole thing about explaining nature design with Mandelbrot fractals (https://en.wikipedia.org/wiki/The_Fractal_Geometry_of_Nature) Its the first thing i think about every time a see a scroll, Mandelbrot fractals, its like scrolls made of scrolls that are made of scrolls:
  8. Hes comments in the video makes me think it is important to note that space pictures colors are not real. "Hubble images are all false color – meaning they start out as black and white, and are then colored. Most often this is to highlight interesting features of the object in the image, as well as to make the data more meaningful. Sometimes colors are chosen to make them look as our eyes would see them, called “natural color,” but not always" Source: https://asd.gsfc.nasa.gov/blueshift/index.php/2016/09/13/hubble-false-color/ And if you really want to understand how they do it: http://hubble.stsci.edu/newscenter/press_resources/skytel200209028034.pdf
  9. Had no problems with the rosinates from recipes 41/42/43 (standard ones, not with calcium) into oil. Dried into powder, cooked (fused?), them cooked into oil. The final color was disapointing so never used them.
  10. @DoorMouse this is a post from 2016, i think it was my second or third instrument, very plain wood, clear oil varnish, and just a bit of sun tanning with some sodium nitrite. And I wondered why i had no flames at all
  11. I had this problem too, and in my case it was my lime that was crap, not the casein. Worked very well with ammonia instead. And yes, there is a whole book about Casein, full of recipes! Casein; its preparation and technical utilisation: https://archive.org/details/caseinitsprepara00scherich This video is the most informative i have found about the process, it not only shows how to make casein, but how to purify it:
  12. I was searching around trying to understand what is going on during the cooking of rosin, i would like to find out if the color change is from concentration or some reaction, and i found this article: http://pubs.acs.org/doi/pdf/10.1021/ie50532a048 Unfortunately it does require some kind of membership to read, maybe someone here have access to it? The available part says some interesting things:
  13. Number 4 suffered my first glazing attempt today
  14. Nice recent article at Strings Magazine by Andrew Dipper: http://stringsmagazine.com/a-look-at-parisian-violin-makers-approach-to-varnish/
  15. Was it, by any chance, "HARDIN, Burton Ervin, 1936- . A COMPARISON OF TWO METHODS OF ARRIVING AT THE MOST SUITABLE THICKNESSES OF VIOLIN PLATES." ? I may have attached it by accident. two methods of arriving thicknesses of violin plates.pdf