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Submit your item online for a free auction estimate. Our specialists can help you find a similar item at an auction or via a private sale. This auction is now finished. If you are interested in consigning in future auctions, please contact the specialist department. If you have queries about lots purchased in this auction, please contact customer services. If you have any complaints or questions about the Conditions of Sale , please contact your nearest client services team. For information and estimates on domestic and international shipping as well as export licenses please contact Bonhams Shipping Department. Previous Lot. Next Lot. Lot Fine Musical Instruments. Follow Share. Own a similar item? How to sell. Looking for a similar item? Find your local specialist. Ask about this lot. A Violin of the Kloz, Mittenwald School circa Labelled Joan. Carol Kloz in Mittenwald An. Additional information Auction information This auction is now finished. Payment Notices For payment information please refer to the sale catalog. Shipping Notices For information and estimates on domestic and international shipping as well as export licenses please contact Bonhams Shipping Department. View Conditions of Sale.

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Lower or higher humidity etc? JacksonMaberry 16 posts. Jim Bress 9 posts. Julian Cossmann Cooke 5 posts. If you are talking about how to get quicker a yellow tint, it seems that washing the wood with soap works pretty well. I heard it from the wood dealer Fuchs in Mittenwald. He sold always this nice yellow maple and when I asked him how he made it he shrugged his shoulders saying: Nothing special, I wash it with soap and then put it on the grass in the sunlight for one day. In this context I should mention that the oxygen produced by the grass in the sun seems to play a role as well. In ancient times cloths were bleached with this method. Instead of soap you can use baking soda which seems the active ingredient in soap as well and then sun tanned them. Works better on spruce than on maple. If you don't like the soda in the wood you can wash it out with water after sun tanning. On a technical level a stronger lamp helps but can be risky because the humidity drops in the tanning chamber. I once cracked a top with it, thereafter I kicked the lamp out of my workshop. I would say better put more UV tubes is a better solution. I can't help thinking that some moisture in the wood helps, a bit like metal rusting, so I take the violin out, mist it with water, and leave it overnight occasionally. I also have a pot of water in the bottom of the light box, although I'm not sure that it does much. I'm pretty sure that fresher wood tans more quickly than old wood, and it develops the ripple in the flame too. If I could, I'd make my violins with fresher wood, and just hang them to season for a year in a bright place. Potassium hydroxide. The nitrates are oxidizer as well , but they produce in their decomposition nitric acid, so must be used sparingly at low concentration so as to not cause long term damage. Keep in mind that there are many different compounds in wood so there is potentially many different types of chemical reactions that can occur that result is color change. Permanent compounds are things that give the wood its basic structural integrity, like lignin, cellulose and hemicellulose. Casual, short term application of solvents, like alcohol and water, has little affect on these. Extractive compounds are things that are easily removed or added by application of solvents or physical processes like heat and humidity. Resins, oils and water are all examples of extractive compounds found naturally in wood. As a general rule, coloring processes that target permanent compounds tend to cause permanent and uniform coloring, while those targeting extractive compounds tend to cause temporary or inconsistent coloring. UV treatment tends to work strongly on the lignin, a permanent compound. But lignin is also the 'glue' that holds the cellulose and hemicellulose structures together. So excessive UV exposure risks compromising the structural integrity of the wood. UV can also cause chemical reactions in the extractive compounds of wood. My current thinking is that 'seasoning' the wood, mostly by exposure to reasonable heat for a period of time, causes a good amount of the extractives to evaporate out of the wood. It is difficult to say if this is always a desirable or undesirable thing, but it at least reduces the effect of some variables from the UV tanning process. So the tanning process starts out rapidly but quickly tapers off as less un-oxidized lignin is available to the light. To reduce the tanning time, you need to use higher wattage bulbs or more lamps. Make sure the wood remains well ventilated so there is adequate oxygen to complete the chemical process, and do not allow the wood to become overly hot as this risks driving other chemical reactions which can cause unexpected results. I have tried baking soda and UV, didn't like the color. Here after a couple of days in UV 6 18W tubes. Unless this is the only instrument you're going to make, tanning isn't really down time. It happens in the background while you're working on other stuff. I guess I don't really see a need to speed things up. There could be a question on how long should it take? If there is something wrong with your equipment or the set-up that's another situation. For me, the wood looks about right in the ball park of hours with my lights and set up. If all of sudden that time jumps to hrs. Sodium Carbonate Na2CO3 is washing soda. Not the same. The one time I put baking soda solution on wood it turned and ugly greenish gray. Other alkalis seem to have the same result. And what kind of soap would you use? Then after tanning you would have to rinse it off? Sometimes I wonder whether 'full spectrum' sunlight is superior to a UV cabinet. Of course, UV has the energy to effect changes, but the IR might help in another manner. Just thinking out loud. I put the two pieces in my light box to tan. Basically trying to do things as near to how I will varnish the instrument. Just now I planed another cut off of the same belly and back that I will exclusively tan with the sun. The sun tanning will be unpredictable because of rain days and the annoying habit of the earths rotation. Interesting you say this. I was thinking the same thing scrolling through the previous posts before reading your post. Strong IR will indeed darken and yellow the wood, before it's starts turning brown and beginning to char. At moderate levels, it may be controllable and advantageous. One thing to consider is moisture reduction when tanning. A violin looses g of weight during the process. This makes a lot of stress to the plates especially the backplate as moisture is drawn out from the outside surface. As a precaution, if you have a soundpost installed take it out before starting. The opposite happens when you stop tanning. I like to wait for a couple of days before I start the varnishing process. You need to be a member in order to leave a comment. Sign up for a new account in our community. It's easy! Already have an account? Sign in here. Home Page. Share More sharing options Followers 1. Recommended Posts. Per Ovesen Posted May 31, Posted May 31, Link to comment Share on other sites More sharing options Replies 93 Created 6 yr Last Reply 2 yr. Top Posters In This Topic 16 9 6 5. Posted Images. Martin McClean Posted May 31, Magic bullet lamps. Melvin Goldsmith Posted June 1, Posted June 1, Andreas Preuss Posted June 1, FiddleDoug Posted June 1, Keep the heat down with fans. Conor Russell Posted June 1, Hi Per. Keep the heat down with a fan. Emilg Posted June 1, James M. Jones Posted June 1, Posted June 1, edited. I tend to think of wood compounds in two general categories: permanent and extractive. Edited June 1, by ctanzio grammar check. Peter K-G Posted June 1, Jim Bress Posted June 1, MikeC Posted June 1, Joey Naeger Posted June 1, Potassium Chromate in water. JacksonMaberry Posted June 1, As your sundial says, 'I count only the sunny days. Bill Yacey Posted June 2, Posted June 2, Peter K-G Posted June 2, As a precaution, if you have a soundpost installed take it out before starting The opposite happens when you stop tanning. Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community. Register a new account. Sign in Already have an account? Sign In Now. Go to topic listing. Recently Browsing 0 members No registered users viewing this page. Sign In Sign Up.

Buy coke Mittenwald