Nice collection! :thumbup:
It appears that one of the celluloid handled knives (with the cracked scales) might be outgassing. This might affect the knives which are stored in its closed proximity too.
Store the celluloid handled knives separate from the rest, and even separate from each other.
Inspect them regularly and look for the telltale sign of corrosion of the exposed part of the blades (the blade portion sticking above the handles when the knife is closed).
Thanks, I didn't know anything about the celluloid issues. I just read all about it. Should I just throw that one away? It is in pretty bad shape?