02/14/2024
Be cautious of hot caustic bluing double gun barrels, even if they are constructed with caustic salt resistant modern solders or brazing!
It is common knowledge that hot bluing salts will dissolve solders/tin used in vintage doubles. Here’s an example of another downside.
As you can see from the forend hook, there is evidence of caustic salts leeching out from underneath it. There were also several spots along the ribs where it was leeching out as well.
You will also see liquid around the forend hook along with under the rear quarter rib(double rifle). That along with the solid salts still remain after all these years(early 2000’s production)
Some might argue a weep hole, neutralizing, and flushing out of the hollow between the ribs would have prevented such.
About 10yrs ago I had the pleasure of working on two Purdey bar-in-wood guns that were sleeved in the UK, and reconstructed using modern resistant solders. Similar story, although the carnage was less. Over time corrosion had congregated around the rib solder joints, as well as around the seam for the sleeve barrels. The void under the ribs had been well flushed out, yet…25yrs years later I was tasked with repair, all due to saving money in hot bluing vs rust bluing.
Apparently the big manufacturers have found ways to flush that area out and neutralize things far better.