Nature of tuning pins

[Berley Antoine Firmin II]

I have always suspected that the bright blue threads on the far right are really just blue layout fluid that machinists use to mark out pieces for cutting. I've used it myself to "blue" screw heads to keep them from rusting.

Berley Firmin 
LaCombe, Louisiana
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080707/2cd2d4ee/attachment.html