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Peroxide works by breaking down into water and free oxygen.
This oxygen will aggressively oxidize anything it contacts.
This is very hard on organic material, microbial matter.
The shell protects the seed for a time while the peroxide degenerates.
I suspect that O2 levels would be elevated while the seed starts to soak in water (a good thing), but the free oxygen is very short lived so will not be sucked into the seed where it would hurt the embryo.
It's like giving the seed a good microbial wash so any microbes on the surface are killed prior to fresh seed tissue being exposed.
This is the cartoon that runs in my head when I think of hydrogen peroxide.
This oxygen will aggressively oxidize anything it contacts.
This is very hard on organic material, microbial matter.
The shell protects the seed for a time while the peroxide degenerates.
I suspect that O2 levels would be elevated while the seed starts to soak in water (a good thing), but the free oxygen is very short lived so will not be sucked into the seed where it would hurt the embryo.
It's like giving the seed a good microbial wash so any microbes on the surface are killed prior to fresh seed tissue being exposed.
This is the cartoon that runs in my head when I think of hydrogen peroxide.