what is lividity? forensics
Post mortem lividity or hypostasis is the settling of blood under the influence of gravity which develops in the early post mortem interval. Lividity generally becomes apparent within a short period after death and is said to Become fixed between 8 and 12 hours after death. Described tests for fixation of lividity include absence of skin blanching after thumb pressure and lack of shifting of lividity after rolling over the body.