Why in rainy season does a loaf of bread turn blue brown or greenish?

During the rainy season, increased humidity creates an ideal environment for mold growth on bread. Mold spores, which are present in the air, can settle on the bread and begin to grow when conditions are favorable, leading to discoloration such as blue, brown, or green patches. This is primarily due to specific types of mold, like Penicillium, which produce pigments as they thrive in moist conditions. To prevent this, it's important to store bread in a cool, dry place.