uguntde

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Everything posted by uguntde

  1. uguntde

    Viola - wolf on the F, G string

    I know a cellist who has a great sounding modern cello. On the front there is something that looks like a button, but not to turn it on , but t turn a wolf off. I have experimented on various violas with small pieces of roofing lead, which I stuck to different places of the instrument (or the chinrest, tailpiece, or fingerboard) with double-sided tape to find the place where a little weight would remove or reduce a wolf note. On the viola that I play I kept a little piece of lead under the fingerboard and it is almost gone. This also removes a peculiar wolf on the open A string which is only there when I don't have my hand on the neck. I also found that violas with a big C string sound tend to have a wolf between e and f on the g-string.
  2. uguntde

    Orange violin ID?

  3. uguntde

    A few old violins compared

    I would go for the Guadagnini. But what strikes me most is how similar they are. We hear them of course all through a cheap microprophone which probably twists the tonal spectrum considerably. There is another such video where they mix in a cheap Mirecourt violin into a mix of interesting violins, and it is really not that bad. Interestignly, if you did this with violas the differences would be much greater. There are stylistic differences in violas (full tone vs nasal) that go way beyond a Bostonian vs a Alabama accent .
  4. uguntde

    Viola strings

    I have used the viola Amber for quite a while and never had a broken string.
  5. uguntde

    Speeding up suntanning

    One problem with UV tanning seems ot be that only a surface layer gets tanned. If the surface gets damaged white wood is revealed. Does the tanned layer go deeper if one uses a high power (1000W) lamp?
  6. uguntde

    Viola strings

    I also like Warchal Amber, prefer them over Warchal Brilliant, but they are similar. Warchal Karneol are very different, and I don't like them as much, for my taste they lack brilliance. The new Larsen Virtuoso are worth trying, I heard them on a viola and liked them. Very bright strong sound. The C-G-D match the success of the A.
  7. uguntde

    Violin ID Quiz

    Are the pegs and tail piece original?
  8. uguntde

    Need opinion on possible maker

    A very nice violin. Does it sound nice? Very high pine linings, not willow. And a very interesting way of deep channeling into the corners. Is this typical for any maker? I guess the varnish is not original. It looks massively French polished. The Füssen instruments I have seen all had a higher arching. This arching looks later.
  9. uguntde

    Violin ID Quiz

    Ebay doesn't mean it is not French. A few years a go I met a guy who bought a undoubtedly genuine G Bernardel in a Menesson case for €30 on a flee market. To say whether it is CM one needs to look at the linings (very high), how the f-holes are cut and the famous signature. The varnish for pere is usually brighter. The wood similar, but not exactly the same. I have seen Chinese of good workmanship, usually they don't get the edge as perfect as the French, and the scroll ends too early (how to I describe this better?). Usually they don't sound as good as CM, let alone Gand and / or Bernardel.
  10. uguntde

    Speeding up suntanning

    I think I bought them there, mine are about 100W per tube. The parameters that count are power (in Watts) and the frequency (uva uvb uvc are frequency ranges). There are no slower photons, they all travel with speed of light. But you can have a higher flux density. I tanned wood with this already, got a nice yellow colour within maybe a week. The uvb dries varnish in a few hours. The more expensive ones are 1000W. Higher power will certainly tan wood faster. How strong a lamp do you use? But the result with a box with 2 x 100 or 150W was quite satisfactory. Sorry for having posted it trice. This was an accident.
  11. uguntde

    Speeding up suntanning

    You can find those cheaper: https://www.easy-lightbulbs.com/light-bulbs/uv-lamps/ They are used a lot. UVB is safe, UVC is much more efficient. Sunlight has a lot of UVC in its spectrum, but this light is eye damaging. The process was analysed in great detail: https://www.ncbi.nlm.nih.gov/pubmed/26974579, Full paper is available here https://www.researchgate.net/publication/297647292_Wood_degradation_under_UV_irradiation_A_lignin_characterization It should also make the wood lighter, as mentioned by others, as fungal treatment does. You need a lot of UV light to seriously damage the wood though.
  12. uguntde

    Speeding up suntanning

    You can find those cheaper: https://www.easy-lightbulbs.com/light-bulbs/uv-lamps/ They are used a lot. UVB is safe, UVC is much more efficient. Sunlight has a lot of UVC in its spectrum, but this light is eye damaging. The process was analysed in great detail: https://www.ncbi.nlm.nih.gov/pubmed/26974579, Full paper is available here https://www.researchgate.net/publication/297647292_Wood_degradation_under_UV_irradiation_A_lignin_characterization It should also make the wood lighter, as mentioned by others, as fungal treatment does. You need a lot of UV light to seriously damage the wood though.
  13. uguntde

    Speeding up suntanning

    You can find those cheaper: https://www.easy-lightbulbs.com/light-bulbs/uv-lamps/ They are used a lot. UVB is safe, UVC is much more efficient. Sunlight has a lot of UVC in its spectrum, but this light is eye damaging. The process was analysed in great detail: https://www.ncbi.nlm.nih.gov/pubmed/26974579, Full paper is available here https://www.researchgate.net/publication/297647292_Wood_degradation_under_UV_irradiation_A_lignin_characterization It should also make the wood lighter, as mentioned by others, as fungal treatment does. You need a lot of UV light to seriously damage the wood though.
  14. uguntde

    Viola sizes and measures

    I would say, violas smaller than 16" are easier to play for most players, but usually lack power, especially on the C-string. If one can't play a 16" one should better stay with the violin. I find 16-16 3/8" the golden middle - you also need ot get the rib height right. I have however recently seen some new violas of 15.5" with a great sound. I have personally not seen a single smaller viola that had a desirable sound.
  15. uguntde

    Borax a as a wood stabilizer?

    Borax occurs as a mineral that does not dissolve in water. Chemically it is similar to silicate, as B and Si are neighbours in the periodic system. Silica gel is a porous form of silicates. Boron does however have its very own chemistry due its 3-bonded nature. The Borax that is sold as a liquid which I assume is a boric acid solution. Sand consists of borosilicates, and glass consists of borosilicates. Do you agree?
  16. uguntde

    Borax a as a wood stabilizer?

    Borax is like ground sand or silica (the silicium equivalent), it is not hygroscopic. Boric acid however is massively hygroscopic, and hence an irritant to skin and eyes. And is is probably the altter that is used to treat wood. My other concern would be that wetting the wood after all the effort to reduce its humidity, and then covering the wet wood with varnish, cannot be a smart idea. The Borax would either have to be applied before drying the wood, or in an oil matrix (like pummice in a ground). I personally believe that boronic acid residues found on old violins come from floating the wood down rivers into Venice, where wood would have been traded in Stradivari's time.
  17. uguntde

    Iron Rosinate

    Which one do you use? Ferric or ferrous chloride? In chemical terms it is Fe3+ vs Fe2+, the former is yellow-red, the latter green. Fe3+ complexes are usually red. But under varnish cooking conditions it shouldn't matter, because heat and oxygen will convert Fe2+ into Fe3+.
  18. uguntde

    Iron Rosinate

    Was this varnish made by cooking linseed oil and rosin or using the Michelman method? It looks nice. I think I prefer the smoother transitinos between no color and color in Carl's violin, but then I prefer the iron red. Does anyone use a good spirit varnish?
  19. uguntde

    Is there arising a crisis in the antique violins market ?

    It is of course a matter of taste. I heard Perlman once live in the Liederhalle in Stuttgart playing Brahms, and almost an hour worth of encores, and I listened to lots of his recordings. And I find his tone intriguing. I am not talking about projection, there is an edge to the tone of his violin, as if it was very rich in overtones. I hear this even now when he plays Schindler's list.
  20. uguntde

    Is there arising a crisis in the antique violins market ?

    Could you also send the aution link? Typically dealers add at least 100%. But they also risk sitting on the violin for a few years.
  21. uguntde

    Is there arising a crisis in the antique violins market ?

    If there is one Strad that I really think outperforms everything else in sound characteristics, it is the soil, at least in Perlman's hands. Why Menuhin sold it nobody knows. Maybe he got bored and liked another.
  22. uguntde

    UV Analysis of Varnish "Systems"

    You may have missed that I asked earlier about the content of the book further up and someone posted links to 3 articles, two of them in scientific journals. I made a statement about these articles that were quoted earlier and about what was stated in this forum (not sure what else you meant). Sorry, but in science work that has not stood up to critical peer review counts nothing. This is how a huge scientific community has operated well for decades. There is lots of non-scientific material with some value, but rigorous review definitely helps to improve quality. I assume that Greiner has done some systematic work, but so far I can't see what he has discovered, and he may not want to tell us because he wants to sell violins and books. I assume he studied UV images simlpy to see whether he can achieve the same fluorescent effects that are seen in Stradivari's varnishes using his own concoction.
  23. uguntde

    UV Analysis of Varnish "Systems"

    I don't have the book, only the summary posted above. Greiner is very smart and has probably worked with scientists who know what they are doing. But nothing is published in scientiic journals (peer reviewed). Can you give a hint of what the book says regarding assigbment of UV spectra or interpretation of UV spectra?
  24. uguntde

    UV Analysis of Varnish "Systems"

    Yes I am a scientist and I have no problem saying who I am, it seems that I left this out of my profile which I opened when I looked for some violin ID (my name is Ulrich Guenther). I guess, I skipped this because the violin world is leasure time enjoyment for me, but I now added my out of date University web to my profile. I am obviously interesed in NMR, and helped build the UK NMR facility in Birmingham since 2004. I do NMR mainly in a biomedical context. Violin varnishes would be material science of which I know not so much but would be quite interested to try. My interest in violins is a hobby, inspired by a remakable lady (whose name was Else Göhrum) about who few people now know, but who was a Flesch pupil and got me interested in violin playing, when I was a Chemistry PhD student in Tübingen. She also designed many new instruments when she was fobidden to play during the Nazi regime in Germany. With this she influenced my taste in tone and music massively, although I have developed since. One aspect of this is that she played a Strad for many years (unfortunately I don't know which one) which she never liked, but said it was much better after it was repared by Hamma. I am lucky to have a number of nice old and new instruments, I select very carefully what I buy. Reparied bows are included when the repair is exquisitly nice. I also play the violin, and now more viola than violin. I have seen many instruments as I travel to London for auctions and have friends who collect. When I have time I take a lesson from a CBSO violist and I play in an amatuer orchestra in Worcestershire where someone recently told me she knew Jacob Saunders (who I have never met in person) from school. And I met Martin socially before he became the UK's most inspiring violin dealer who can play and judge. When I walked into a violin shop in Italy many years ago I saw facsimiles of (old) varnish recipes which get me going to try my own. I have made many and some are very nice, which I pass on to a local violin maker. I travel a lot profesionally and usually visit the violin makers whereever I am. I am always polite, although I like some more than others. Now you have 20% of my life history, I guess I am an old man with and old man's hobby which a friend once called wooden toys, Holzspielzeug.
  25. uguntde

    My Linarol viola

    What did you like about Linarol's design? It is not what other people would copy. I guess the Storioni is also one you made. I like violins and violas that are not Strad and Guarneri copies. I am not sure I would have tried Linarol. These f-holes are definitely on the ugly side.