Science of shrink wrapping ?

[rosiethechicken]

I am new to incubating and learned lot of things with my recent try. I am trying to better understand science of shrink wrapping.
My interest is in answering questions such as

a) what is really going on
b) why helping at wrong stage is actually bad


Appreciate your thoughts and wisdom in this area. Here is what I understand so far :


There seem to be three visible layers to egg - shell, white wafer and then another layer of transparent wafer.
The transparent wafer seem to carry blood vessels around the shell.

Few things need to happen for successful (blood free) hatch

1. Chick pips and start to put lungs to use
2. Biological processes kickin and start to draw blood from the external vessels into chick body
3. Transparent layer slowly dries out as blood is withdrawn into body
4. Transparent layer and white layer seem to become one as they dry out slowly (at/with appropriate moisture levels)
5. Chick now has clean and relatively dry layers to zip through around
6. Chick comes out after successful hatching

Blood becomes sticky (coagulate) when exposed to air, hence, it would be best contributor to "shrink wrapping", that's so tight that chick cannot escape successfully.

It seems moisture (lack of) is not the only contributor to shrink wrapping. Blood exposing to outside air and coagulating before being withdrawn from transparent layer probably contributes more to the shrink wrapping than just the moisture levels.

Your thoughts ?

 

[Stephanie739]

I'd like to read responses, just heard about shrink wrap yesterday.