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ground substance possibilities?

 
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jethro
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PostPosted: Sat Oct 08, 2016 5:11 am    Post subject: ground substance possibilities? Reply with quote

Wondering if anyone hax experimented with solids to be ground or to go in
as a ground additive?
thinking of more unusuas stuff....
like graphite or carbon disulfide,talc,quartz, or even highly colored iron or zink
compounds .... or even pure metals ground to micron size.......
possibly a thick paste mixed with linseed oil or just a dry rub ?
there used to be a product called "rub-n-buff" which was a paste loaded with
Various solid pigments. Used for picture frames.
might make an interesting starting point for coloring......
tim
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rs
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Location: Holland, Michigan

PostPosted: Sat Oct 08, 2016 11:23 am    Post subject: Reply with quote

This is a good question. I would love to duplicate the Pietro Guarneri yellow ground. It is subtle but beautiful. Maybe one day.
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L P Reedy
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PostPosted: Sat Oct 08, 2016 5:16 pm    Post subject: Reply with quote

Many of us have tried that and some still do. I don't think graphite would help, unless you want an opaque ground. Carbon disulfide is not a solid. It is a very volatile, toxic and highly flammable liquid. I've used ground glass and rouge, long ago.
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jethro
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PostPosted: Sat Oct 08, 2016 8:16 pm    Post subject: Reply with quote

Sorry -- big brain fart---- NOT carbon disulfide...
I ment molibidumum disulfide...... it may be opaque too ....

Was just noticing I had a rubber boat roller laying around that I never used.
It is a cylinder with a wheel on each end. Mount 2 of those on a platform
about 3 inches apart and drive 1 with a small slow motor--- then all you need is a suitably shaped jar and some ss balls.

Something like polishing rouge might be a possible component.....
I think its an ingredient of womens face powders.

There may be some off the shelf abrasives that might work as long as they are very fine ones......

I would think something tansparent or translucent would be on the possible list.... though I would think all the pigments in the commonly used oil paints are all opaque.....

Maybe I can whip up a cheap and dirty ball mill ......

T
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Chet Bishop
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Location: Forest Grove, Oregon

PostPosted: Wed Oct 12, 2016 10:41 pm    Post subject: mineral ground Reply with quote

Do you mean Molybdenum disulfide?
https://en.wikipedia.org/wiki/Molybdenum_disulfide

I use gypsum powder. I mix it with coffee while rubbing it in, but it dries chalk-white. Then, as I apply my sealer, it goes completely transparent.

So far, I like the results.

This the dry mineral ground, (on a 14" viola) before sanding off the excess:


This is the same plate after applying the sealer, but no varnish:

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Chet Bishop
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Last edited by Chet Bishop on Sat Oct 15, 2016 11:38 am; edited 2 times in total
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Chet Bishop
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PostPosted: Wed Oct 12, 2016 10:52 pm    Post subject: Reply with quote

And... the same plate after varnishing:

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Dave Chandler
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PostPosted: Thu Oct 13, 2016 6:02 pm    Post subject: Reply with quote

Well, now, am I impressed!!! Very nice and just in time, I'm working on a cello I have to have varnished by VSA time. (Not that its going, just that I'm not coming back home till March and I want to leave it set and get good and hard before polishing/finishing up.
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Chet Bishop
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PostPosted: Fri Oct 14, 2016 10:22 am    Post subject: Reply with quote

I had intended to have this set up and playing by now, but getting ready for winter has taken priority. 8 cords of firewood in, which will be enough for at least two years, I think, and I climbed up and cleaned the chimney, just in time for the (probably 10-day) rainstorm we are now having.

Helped my wife pick all the rest of the apple crop (which she is now drying...) and then the washing-machine went on the blink. New tub-seal time, I think. That varnish should be good and hard by the time I get to it. Smile
Ah, well...sounds like life, doesn't it?
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FiddleDoug
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PostPosted: Fri Nov 25, 2016 11:07 am    Post subject: Re: ground substance possibilities? Reply with quote

jethro wrote:
Wondering if anyone hax experimented with solids to be ground or to go in
as a ground additive?
thinking of more unusuas stuff....
like graphite or carbon disulfide,talc,quartz, or even highly colored iron or zink
compounds .... or even pure metals ground to micron size.......
possibly a thick paste mixed with linseed oil or just a dry rub ?
there used to be a product called "rub-n-buff" which was a paste loaded with
Various solid pigments. Used for picture frames.
might make an interesting starting point for coloring......
tim


I don't think that you want to use anything dark/black, and opaque in a ground. It would just make the fiddle look really dirty, and not enhance anything.
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Franciscus
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PostPosted: Wed Dec 07, 2016 1:34 pm    Post subject: Reply with quote

Chet, can I ask what was the sealer for this violin?
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Chet Bishop
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PostPosted: Wed Dec 07, 2016 11:28 pm    Post subject: Sealer Reply with quote

On this small viola, I used a mixture of pine pitch and turpentine, with a few drops of amber dye. (transtint.)

The whole varnish procedure is in these three links:
http://www.bluefiddles.com/2016/09/finishing-sequence-part-one/
http://www.bluefiddles.com/2016/09/finishing-sequence-part-two/
http://www.bluefiddles.com/2016/10/finishing-sequence-part-three/
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Franciscus
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PostPosted: Thu Dec 08, 2016 1:58 am    Post subject: Reply with quote

Thank you very much, Chet, for the answer and for the links. I enjoyed reading.
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