Brown cleaning patch

[coupe]

After a range session last Thursday I cked my barrel with a white patch and it came out brown again. This happens alot after a few days post range, thinking it is rust even after all the drying and lubes I decided to use phosphoric acid to see if it would react as it will with known rust. I wetted the brown streaked patch with it and no reaction at all. It will turn rust black on steel as a conversion coat but nothing so not rust. I believe the lube is color changing and gives a resemblance of rust color. Happy about that!
coupe

 

[oldwood]

The two rifles I use now both show a brown color on the patch after cleaning. Been that way for 50 + yrs. , with no bad result.

 

[Flint62Smoothie]

Question - What was your STORAGE product, oil or other?

FWIW I use Birchwood Casey's 'Barricade', a liquid wax protectant. It is a slight amber in color so it will show a slight brown patch before shootin'. Maybe you have a similar occurrence with whatever product YOU are protecting your bore with?

 

[TechMoron]

Don't know about others but, 'Rem-Oil' will turn brown pretty quickly.

 

[stronics]

Gentlemen, RIG it.