The brown liquid from the mouth after death is called purge fluid.
The purge fluid that comes out of the mouth after death is a foul smelling, red to brown fluid which can exude from the dead persons oral and nasal passages as the decomposition of the body progresses.
Purge fluid after death will usually occur 2-3 weeks after death.
purge of putrid bloodstained fluid from body orifices can also occur after death.
Cells in tissues break down and release hydrolytic enzymes, and the top layer of skin may become loosened, leading to skin slippage.
Decomposition of the gastrointestinal tract results in a dark, foul-smelling liquid called "purge fluid" that is forced out of the nose and mouth due to gas pressure in the intestine.
The immediate post-mortem changes are dubbed as the “signs or indications of death.”
Immediate changes include insensibility, loss of voluntary movements, cessation of respiration, cessation of circulation, and cessation of nervous system functions.
The brain and nerve cells require a constant supply of oxygen and will die within a few minutes, once you stop breathing.
The next to go will be the heart, followed by the liver, then the kidneys and pancreas, which can last for about an hour.
Skin, tendons, heart valves and corneas will still be alive after a day.
In the last 5 minutes before death the facial muscles may relax and the jaw can drop. Skin can become very pale.
Breathing can alternate between loud rasping breaths and quiet breathing.
Towards the end, dying people will often only breathe periodically, with an intake of breath followed by no breath for several seconds.
In the bloated stage of death, body parts, including organs and soft tissues, swelling due to the accumulation of putrefactive gases or other decompositional products from the putrefaction process.
It usually starts in the abdomen and then slowly affects other parts, including the face, breasts, and genitals.
The digestive and respiratory systems begin to shut down during the gradual process of dying.
A dying person no longer wants to eat as digestion slows, the digestive track loses moisture, and chewing, swallowing, and elimination become painful processes.
A conscious dying person can know if they are on the verge of dying.
Some dying people feel immense pain for hours before dying, while others die in seconds.
This awareness of approaching death is most pronounced in people with terminal conditions such as cancer.