Theory 111/Bread staling/Ratio lens
Crust Softening Is Humidity
The claim
Crust softness is set by the ratio of internal moisture migration to ambient humidity, so bread in dry air loses crust crispness while sealed bread loses crumb softness.
01Mechanism
Water moves from crumb to crust to air; the ratio determines the direction and the texture.
02Prediction
Texture should track the ratio.
03Refutation
Texture tracking storage time would remove humidity.