Porter & Fraser....yeah a little chipped on the spout.....I still love it. It was covered in rust when I dug it. Took me 2 weeks of soaking and scrubbing to reveal anything (I didn't want to use any kind of acid).
Here is the patent drawing for the closure. Carl Schultz, who was a bottler himself, apparently bought the patent but never used it for his bottles. Pretty early bottle (1872 patent).
Depends on the strength, but most things tend to be acid or base-- 7.00 is neutral. 0.00 will wreck almost anything. So will 14.00. If I recall, it's the lower the pH, the more acidic. That bottle is so unique-looking. Not too common a closure, though? How long were they in use?
I used Dish Soap and elbow grease.....no acid there lol. I believe it that there are only 5 known intact examples of that bottle.....never seen one like it!
Although not my oldest finds, these are by far my rarest and my favorite finds. The C.V Hurley is an early tin top from Asbury Park and is the second one known. The A.T Rogers is one of the most desirable NJ shore milks because it is one of the only bottles from Bradley Beach. On top of that mine is an unknown variant. Pulled both of these out of a small coastal lake.