I have some of the rosewood from Pacific. A few things about it:
It turns a nice maroon/red color when wet.
It's buoyant for a week or two. After a week of soaking, it will become water logged and will sink.
I haven't noticed any parameter changes since placing it in my tank. However, the tank it's in has taken on a light tea color. Though that might be due to the MGOCPM under my sand...