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  1. Gluing centre joint

    Not quite on the subject but the best center joins and easiest I found was an MN tip to just clamp one half vertical in a vice, rub and set the other half and let gravity do the rest. I added driving nails on each end running some elastic bands around them. I once had to break and start again trying to use clamps.
  2. Turpentine concecuenses

    Hi Tango- it depends on your purpose, if you just want to varnish an inst, use whatever works best for you. There are around 25 compounds in turpentine, a few have a low vapor pressure so it takes a long time for them to evaporate. Thinning an oil based varnish so it takes around 6 coats shouldn't be a problem. I've never tried Diamond G turp, but I'm pretty sure Joe R has experimented enough to know it is the only turp worth using. fred
  3. turpentine

    Hi Joe, thanks for the description. I guess the word caustic is used as an unpleasant result. Thanks again fred
  4. turpentine

    Carlo, sounds like you got your share of poor weather. Staying with varnish is a lot more frustrating, but safer- fred Hope someone can describe what they observe when the caustic reaction occurs. fred
  5. turpentine

    Appreciate any description regarding the caustic reaction mentioned in some posts. Hi Carlo, welcome back from the other world. Any weather where you were citing a few prayers? fred
  6. Recognize this resin?

    Hi Mike- could that unknown resin you have is the fossil congo copal I sent to you when you were interested in making varnish? fred
  7. Input needed colophony + nitrocellulose?

    Text states resins are added to provide surface adhesion which cellulose lacks, colors are generated using ordinary mineral and metal pigments. They even have a Tuscan Red!
  8. To Seal Or Not To Seal?

    Hope someone remembers a statement where Cremona inst's were relatively free of worm infestation, contrary to another region ( could be opposite of what I remember). Can infestation be from inside and reason for a coating?
  9. Cobalt dryer

    Hi Michael, it is from Protective and Decorative Coatings by Mattieillo. I've attached info on the contents of raw and burnt umber. Pigments like ochre or sienna have much more silica so produce more transparency to the varnish. Umbers do just about all you need. Hope you're busy with shopping for the holidays. fred
  10. Cobalt dryer

    Hi Uncle Duke, I was probably stating that if you are using umber pigment it contains manganese so no need for a drier. I use umber to color the varnish. I've attached some information on driers that for some reason isn't interested in attaching. fred
  11. What makes turpentine "bad" or "good"?

    Think law still allows up to 15% "other" ingredients like water, industrial solvents, etc. Some doesn't even smell like turp. Turp extracted from old stumps can't be labeled Gum Spirits of turp. Imagine Cremona turp, probably contained pine oil, methyl alcohol and other distillates I forgot
  12. Thinning varnish

    Hi E, (Ipr5184), Thank you for the kind words. Somewhere in the cooking it is possible to wind up with that more reddish than brown color that is so elusive. Hope you can capture it. I've wandered off the varnish trail on to the yellow ground path of frustration when I got the thought that Strad had money so he had a classy horse carriage equaling his status. Rereading Neal's 1833 varnish paper where he states " I got up a patent (Turner?) yellow pannel" could indicate this is a standard procedure undercoat prior to varnishing something like a horse carriage and could be familiar with inst makers. Turner Patent Yellow is made by mixing litharge and sea salt to produce lead oxy chloride. It cannot be purchased, you have to make it. I've made it but i I can't get the yellow since Kremer's litharge is reddish. Maybe go back to varnish frustrations- fred
  13. Thinning varnish

    Hi Weller, seems like adequate color, and it will probably clear up as stuff settles out. Now that yellow ground........ fred
  14. Thinning varnish

    Hi Weller, with umber our cooks are pretty similar except for jar height and cook length. Besides a lid smear it would be interesting if you can get color in 3 wipes on spruce. fred
  15. Thinning varnish

    Weller Williams, If you thin it with turp can you make a finger smear on the jar lid or any impervious surface to get an idea of drying time to tack free. It would help if you can write up your process for us, eg, how long the cook before and after reaching foam, how long at foam, color changes. Seems your jar is much taller than a 4 oz baby food jar that I use, so your cook retains a different mix than mine. My shorter jar allows the escape of contents with lower vapor pressures than your taller jar, and I include metals to generate colors, so our cooks are different. My lid smears are usually tack free in10-15 hrs. Interesting to see what your drying time is. fred