Restore Antique Brass Clock: Remove Orange Discoloration

  • Thread starter Thread starter mnmclockman
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the restoration of an antique brass clock, specifically addressing the issue of orange discoloration that has appeared on the brass surface during polishing. Participants explore the nature of this discoloration and the implications of attempting to remove it, considering both technical and historical perspectives.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes the presence of orange discoloration on the brass, which does not respond to polishing and is not indicative of corrosion.
  • Another participant suggests that the discoloration may result from impurities in the brass or an oxide layer, particularly in older materials that may not meet modern standards.
  • A different viewpoint emphasizes the historical significance of the discoloration, advising against removal to preserve the clock's integrity and value as an antique.
  • A suggestion is made to consult an antique specialist before making any alterations to the clock.

Areas of Agreement / Disagreement

Participants express differing views on whether the discoloration should be removed. While some suggest it may be an impurity or oxide layer, others argue for preserving it due to its historical significance. The discussion does not reach a consensus on the best course of action.

Contextual Notes

There are limitations regarding the understanding of the materials used in the clock's construction and the potential implications of altering its appearance. The discussion highlights the uncertainty surrounding the nature of the discoloration and its impact on the clock's value.

Who May Find This Useful

This discussion may be of interest to antique restoration enthusiasts, collectors of vintage clocks, and individuals seeking advice on preserving historical artifacts.

mnmclockman
Messages
2
Reaction score
0
I'm currently restoring an antique brass clock. In the course of polishing the badly tarnished brass, I have come across some areas of discoloration which do not seem to buff or polish off.

These areas are orange-colored (look like bronze) rather than the yellow brass color of the rest of the piece.. They are not depressed areas of corrosion, but appear to be simply discoloration on the flat surface of the brass.

I have been unable to remove them with polish or buffing, and am wondering if anyone can provide guidance on what they are, and how to remove them.

It is not an option to deeply buff or grind the brass surface, as that would destroy the dimensions of the multiple brass pieces whch assemble into the completed clock.

Thanks in advance. Martin
 
Engineering news on Phys.org
There are sometimes other materials added to brass to make it more corrosion restant especially for marine applications so 'brass' isn't necessarily brass.
If this is an antique clock it could just be that the brass wasn't as carefully controlled as it is now and this is some extra impurity that is forming some sort of oxide layer.

Sorry don't know specifically what it might be or how to get rid of it.
 
Welcome to PF, Mnm.
I would seriously recommend that you not try to get rid of the discolouration. It appears to be an intrinsic aspect of the clock's construction, and thus has historical significance. At least consult an antique specialist before doing anything. If it has any worth as an antiquity, then altering it would destroy that.

edit: Try PMing Hypatia. She's an antique dealer.
 
Last edited:
Thanks very much for your responses. I'll leave the discoloration alone. Martin