Kraig Biocraft Laboratories Inc (KBLB)

[es1]

The couple of hours is correct.
That's why the leaves are processed for storage.


ABSTRACT from paper 

"Mulberry leaves blanched with hot water were put into polyethylene bags, and stored in a freezer
after as possible had been removed. Then, these mulberry leaves were fed to silkworms to
assess their feed value.
Blanching with hot water prevented mechanical damage to the cells and leakage of the content
of the cells during the freezing and thawing processes. It also inactivated the water soluble oxidase
that is activated by freezing and freezer storage. Blanching at 100oC for 30 seconds was the
optimum condition for blanching. Under this condition, the chlorophyll content of the leaf was
not decreased but about 20% of the carbohydrates were eluted into the hot water. Drying of
mulberry leaves by freezing was prevented by storage in polyethylene bags, and the water content
of the leaves was maintained at 70-75% even on the 120th day of storage. The parent silkworms
for hybridization reared on the stored mulberry leaves become mature and laid eggs."

https://www.jstage.jst.go.jp/article/ko ... 2_137/_pdf