Telling safe tissue apart from dangerous spoilage comes down to a few sensory checks. Genuine mold spores require air and moisture to thrive. While a cracked stem can sometimes admit opportunistic fungi, true spoilage leaves obvious warning signs throughout the fruit cavity.
Examine the color and texture of the growth. Vegetative callus tissue remains crisp white or off-white, resembling tiny sugar crystals or sterile plant matter. Real fungal mold quickly shifts into dusty gray, green, or pitch-black velvet. It produces a musty, cellar-like stench that overpowers the fruit's sweet aromatics.
Inspect the fruit flesh immediately bordering the pit. If the surrounding peach is firm and vibrant orange or yellow, scoop out the broken pit fragments, rinse the center, and proceed with prep. If the flesh adjacent to the split is mushy, brown, water-soaked, or leaking cloudy fluid, discard the entire peach. Pathogenic molds create micro-fissures in soft fruit that carry invisible toxins deep into the flesh.