It seems that in my country (I am from Ukraine) is not very easy to get the two-way glass mirror.
One company made for me two-way mirror from regular 4mm thickness glass by titanium coating-in-vacuum technique. It has size 560x780mm. I have asked for transparency rate 30%.
When I took it to home and compared to regular mirror - my “two way mirror” looks darker as compared to the regular mirror.
For me, it is not comfortable to use such dark reflection in the bathroom.
I am attaching the pic to this post - you can see the reflection of window in both mirrors - regular and two-way mirror.
I have looked through the examples of already completed mirrors and some of the are also looks darker, some are pretty light.
Could you please write down there - whether your mirror is darker then the regular one?
I want to clarify this stuff for me because I have nothing to compare with.