When visited the Red Pyramid in spring 2010 the ammonia smell inside was surprising. Originally I thought about the most common source for that smell as being the same as in pedestrian railway underpasses in large European cities. But all other ancient sites I visited there in Egypt between Dashur and Cairo were very clean inside without smell. The Red Pyramid was otherwise clean and the visitor frequency at least back then quite low, I was even the only person inside until the next small group climbed in when I exited.

So there may be something else behind that Ammonia smell in the Read Pyramid. There are also some notes online at other sources about that.

And why is Amon named similar to Ammonia?

Anyone else noticed that when visiting the Red Pyramid?

Context:
In the this new video, sorry only German language, the author talks about the Red Pyramid and the Great Pyramid potentially having been used as chemical reactors to produce ammonia in the Red Pyramid and Acid in the Great Pyramid:
[www.youtube.com]