uguntde

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Everything posted by uguntde

  1. uguntde

    Kloz ID

    A violin without label, although one can see where the label was. One pece front and one piece unfigured back.I would say this has to be a Kloz of some kind. Georg II? The f-holes are untypical. Can supply more pictures for better ID. The top and bottom blocks more square shaped and not round (more what I know from French instruments). The corner blocks exxtend further into the (one piece) bottom rib than intot he C-bout ribs. Sounds nice, dark tone, typical for such a highly arched instrument
  2. uguntde

    Madder Alum Rosinate

    What I wonder about Michelman is how this varnish dries, as the rosinate and drying oil are not fused. If you cook them together you get an extremely well drying varnish, I get a drying time of 3h in UVA.
  3. uguntde

    Challenging repertoire for post-Grade 8 violinist

    As a Christmas present I would get a nice edition of the Mozart or Beethoven sonatas. This is something to enjoy for many years and it is unlikely that a young player already has this. The 2nd volume of Mozart sonatas is all playable for a grade 8 and some are very beautiful.
  4. uguntde

    Challenging repertoire for post-Grade 8 violinist

    If you asked me for today I would ask for the Shostakovich quartets, or at least his violin sonata. But you must be ready for those.
  5. uguntde

    Madder Alum Rosinate

    I recently dissolved rosin in alkaline solution and precipitate with Fe SO4. Air oxidises the Fe2+ quickly to Fe3+ which so redbrown. I added a little rosin and cook this briefly together, then added an equal amount of linseed oil and heated this for one hour. I get a relatively hard sticky substance that dissolves in turpentine.
  6. uguntde

    Challenging repertoire for post-Grade 8 violinist

    The Franck, Brahms, or Beethoven sonatas?
  7. uguntde

    Kloz ID

    Let me ask this way. If I took it to H Köstler and asked for an expertise he would probably come up with something. If he assiged a name to it, would you believe him? If not, I'll call it Kevin Kloz from now on.
  8. uguntde

    Kloz ID

    That's my question. Can we assign a name to it?
  9. uguntde

    Kloz ID

    Yes there is a very well repaired crack in the back, left bottom, studded inside. Not close to the sound post. No soundpost patch on the front which is amazing for a fiddle this age.
  10. uguntde

    About violin bridge tuning

    I think what they were after is the yellow colour of bilirubin breakdown products. Horse should be as good as any, as this arises from haemoglobin breakdown, and not any specific food ingredients. Whether Aubert still does this I don't know. It is my impression that most of the Chinese bridges sold in a bundle are just as good. Hardness of wood is all that is needed.
  11. uguntde

    About violin bridge tuning

    I heard from someone that the pricier Aubert bridges were cured in horse urine. Is this true? If anything urea deposits would make the wood heavier.
  12. uguntde

    UV Cabinet

    I recently tried UVC 35W for tanning (2 90cm tubes) - works extremely well. Just need to switch it off before opening the box, as UVC damages about everything on the human body.
  13. uguntde

    Can anyone help translate/read this?

    Makes some sense as the last letter of that name could be an ü. Hath..ü, could also be Häth zu Karlburg. The name Johann is as German as it gets, but also known as a Hungarian name. http://magyarnevek.com/nevek/ferfinevek/J In their list starting with H http://magyarnevek.com/nevek/ferfinevek/H nothing Hungarian suits your label.
  14. uguntde

    Can anyone help translate/read this?

    But there is no squiggle over u in Karlburg and the letter in the na,e looks clearly like an a. Hath or Häth. Admittedly, this would be a strinage sounding name though. The script is also not a cear altdeutsche Schrift, but a mix of the same and Druckschrift.
  15. uguntde

    Can anyone help translate/read this?

    Maybe he means that he replaced the front, looking at the front as a Deckel?
  16. uguntde

    Violin ID (again)

    Where would the red varnish drops on the inside come from? It doesn't look as if the varnish had been sprayed on.
  17. There is now a Facebook group to sell violins ... trying to look more serious than ebay. What I have seen there was massively overpriced or rubbish.
  18. uguntde

    Removing shellac overvarnishing. Help!

    Rub the new spirit stain stuff off with ethanol or isopropanol, hoping that the varnish underneath is not spirit soluble. Even an old spirit varnish will not come off easily. But you can make a terrible smear with this method, you may also be lucky. Otherwise there is probably no such thing as fine grit sand paper.
  19. uguntde

    Tool rust advice

    Vinegar will cause a disatser for some metals, please be vareful. Phoshoric acid works. I would get car rust remover.
  20. I thought Austria just offered the Tyrolians citizenship, so what's the difference?
  21. uguntde

    Thoughts on this interesting violin? n

    The fittings are old English fittings, probably made of holly. I see these pegs a lot on in England. Scratched in purfling is typical for some simpler 19th century English instruments. The scratch marks may have been done by a kid who was bored by practicing .
  22. uguntde

    Purpose of tuning the fingerboard

    I have a really good sounding viola. It is made very light, with a light fingerboard with reduced thickness (many Degani violins have this). If I don't touch the neck the open A has a strong wolf. As soon as I touch the neck this is gone (this is why it took a while until I noticed that interesting feature). I then experimented with small weights - I used roofing lead with doublesided tape - to tune this fingerboard. And with an extra 2g of weight the wolf disappears. The overall sound character is not much influenced though. I can try to get a spectrogram with and without the lead to identify how it shifts A0.
  23. uguntde

    Oil Varnish

    Chemists would use an electrical heating mantel. But this does not distribute heat evenly, nor does a sand bath. You also need a magnetic stirrer to keep temperature exposure more even. All of this seems an overkill, I can't see classical makers using anythong but a wood fire, maybe an oven, but without any temperature control.
  24. uguntde

    Oil Varnish

    The melting point of abietic acid is around 175˚C. A 'foaming point" is not a chemical property. Melting = boiling. This will be lowered by imputities (ebullisocopic propertes). If you slowly change colour you get all kinds of oxidisation products, unlikely carbon. If you really burn it you end up with residues of what is there besdies abeitic acid and some tar like long chained products, besides CO2 (in the presence of oxygen). Some slowly oxidised rosin can have very desirable colours for varnish. If I ready Hargrave's bass article correctly he colours his varnish just this way or by adding a little nitric acid. However 200 ˚C is certainly enough for all of this.
  25. uguntde

    Oil Varnish

    I think the darkening of the colour is a kind of burning the rosin. I can't see an oxidisatino process that would change the colour in the same way. The burn fraction is probably small and may have a desirable effect on colour. But some of it is probably not abietic acid any more.