preservatives keeps the bread fresh for about 35-40 days, after that time it will probably start growing little dots of mold
Perhaps because it is more visible on white than on rye. Rye was not included in the question. Bakery bread does not normally include preservatives. Other commercial breads do include preservatives which prohibit mold growth.
Bakery bread often contains less preservatives than that in a store.
Wheat bread - no preservatives
white bread because it has more preservatives in it.
No, they do not. I tested the bread and the flat bread molded the fastest, then wheat bread then sourdough bread. White does not mold because of the preservatives in it.
The bread mold can stop when perservarives only hold off the date of molding,thus preserving the bread
Hand soaps and hand sanitizers prevent the growth of bread mold because bread mold is a bacteria and the PH level of soap and the alcohol in hand sanitizers can prevent the growth of the bread mold.
White bread without preservatives will mold first. The butter and sugar will likely impede the growth, and wheat bread is usually drier than white bread. It would make an interesting experiment, using several controls (amount of water, temperature, sunlight, and amount of each substance on the bread)
I think they put fewer preservatives in whole wheat bread.
How fast a bread molds depends on the amount of preservatives in the bread. If a bread has a lot of preservatives in it, it will mold less quickly than breads that don't have preservatives, no matter if it's wheat or white. Wheat breads are more likely to be "natural" and "preservative-free" though.
Humectants
get a piece of bread that has no preservatives and spray a little bit of water on it and leave it alone.