How can you tell if a TFT has 6 bit or 8 bit colour

[decimator]

(Yes I know, two threads in one day - sue me! )

This seems to be one aspect of a monitors specification that isn't always clear from the specs, so I was wondering if there was rule of thumb or some other way of deducing this from other items in the specification.

 

[Baddass]

generally more often than not:

TN Film panels = 6-bit + FRC
IPS / Va panels = 8-bit depth

 

[decimator]

generally more often than not:

TN Film panels = 6-bit + FRC
IPS / Va panels = 8-bit depth

Ah right, that makes sense, looks like I am going to have spend £200+ if I want 8 bit colour, but then you hear people going on about how the IPS screens have 'input lag'