Foro Flamenco
Posts Since Last Visit | Advanced Search | Home | Register | Login

Today's Posts | Inbox | Profile | Our Rules | Contact Admin | Log Out



Welcome to one of the most active flamenco sites on the Internet. Guests can read most posts but if you want to participate click here to register.
This site is dedicated to the memory of Paco de Lucía, Ron Mitchell, Guy Williams, Linda Elvira and Philip John Lee who went ahead of us too soon.
We receive 12,200 visitors a month from 200 countries and 1.7 million page impressions a year. To advertise on this site please contact us.





French polish turning green/gray   You are logged in as Guest
Users viewing this topic: none
  Printable Version
All Forums >>Discussions >>Lutherie >> Page: [1]
Login
Message<< Newer Topic  Older Topic >>
 
BionBit

 

Posts: 2
Joined: Jun. 21 2020
 

French polish turning green/gray 

Hello all,

Today I've noticed an area on the side the guitar that has a green/gray tint, which wasn't there before. Does this normally happen with french polish? Oxidation maybe?
The guitar is stored in a solid case when not played, room temperature and humidity should be in the normal range.

I'm playing a concert Francisco Navarro made this year (beautiful guitar by the way).

Attachment (4)
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 14 2020 20:16:36
 
constructordeguitarras

Posts: 1405
Joined: Jan. 29 2012
From: Seattle, Washington, USA

RE: French polish turning green/gray (in reply to BionBit

I suspect that it is wax blooming out of the finish. Sometimes that happens if the shellac was not sufficiently dewaxed. Though I've only experienced it happening on bindings for some reason.

_____________________________

Ethan Deutsch
www.edluthier.com
www.facebook.com/ethandeutschguitars
www.youtube.com/marioamayaflamenco
I always have flamenco guitars available for sale.
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 15 2020 5:43:22
 
RobF

Posts: 724
Joined: Aug. 24 2017
 

RE: French polish turning green/gray (in reply to BionBit

Do you sometimes rest your chin on the bout when playing? I’ve seen a yellow/green discolouration in the shellac on the lower bout of a guitar which was due to sweat accumulation that was not being cleaned off the guitar. The stain looked similar to how a white shirt can sometimes get stained around the armpits. I read that the sweat itself doesn’t cause the discolouration, as it’s colourless, instead it’s from the discharge of bacteria that feeds off the sweat (something to think about if you’re resting your chin on the guitar, lol).
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 15 2020 8:38:27
 
BionBit

 

Posts: 2
Joined: Jun. 21 2020
 

RE: French polish turning green/gray (in reply to BionBit

Thanks Ethan, Rob.

Yes, that's a good point, I do rest my chin in that area. While I use a cloth for cleaning the guitar once in a while, I didn't expect the shellac to be affected. Did thought about breathing there which might be related.
My other guitar (classical built) has a Polyurethane finish, which is stronger and never had this issue.

I like the shellac more but damn it's sensitive!
As long as it's just coloring and doesn't affect the wood, it doesn't bother.

Cheers!
  REPORT THIS POST AS INAPPROPRIATE |  Date Oct. 15 2020 9:25:25
Page:   [1]
All Forums >>Discussions >>Lutherie >> Page: [1]
Jump to:

New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts


Forum Software powered by ASP Playground Advanced Edition 2.0.5
Copyright © 2000 - 2003 ASPPlayground.NET

0.0625 secs.