1. How could Sherlock not poisoned after drink Embalming Solution (Formaldehyde)?
2. How could Sherlock had cardiac arrest?
At the first time, I can't find the most suitable / logic answer, because if we want a precise answer we must conduct some medical research. and of course, we need a lot of money, time, and some volunteer to do it.
then I have some speculation..
A. About the embalming solution..
- S.H put another pellucid solution that similar like Formalin in the Embalming Solution' bottle (such as Aquabidest, physiological saline)
- S.H dilute some formalin solution so the contents are not too dangerous for health.
B. About heart failure ... (I'm quite sure, Holmes doesn't have any heart problem history)
- SH suffering circulatory shock due to blood loss because of stab wounds on his shoulder. probably the wound in his shoulder injure one of the subclavian arteries / veins . Moreover he must use all his strength to survived, and of course his heart work really hard for it...
well I think I don't have any speculations left. I would glad if someone add more.. :)