Differentiating Corrosion from Bronze Dicease on AE coins

Hey, recently bought a 250 coins lot, some of them I suspect have obvious BD, some other subdued? But I'm not sure in either case.

I've remove the obvious part (light green/turquoise colour crumbly dots)

Some coins looks okay but then when I break a piece of the patina/dirt I find some strange looking under layer, which looks like BD I would say, or some kind of salts. It's not fluffy but a bit crunchy to the tool.

Here are the photos:
 

If it is hard and stable it should be verdigris that protects the metal, if it's a lighter fuzzy or furry green coating that can be scraped off the surface using a fingernail or a wooden pick it's bronze disease that can be destructive if left untreated.