Texture changes can provide another clue. If the cheese feels unusually wet, sticky, slimy, or soft in areas where it should remain firm, spoilage may have progressed beyond a simple surface issue.
Experts emphasize that visible mold is only one factor in assessing food quality. Any combination of unusual smell, texture, and appearance should be considered together.
The Recommended Way to Remove Mold
If mold is limited to a small area on a hard cheddar block, food safety specialists generally recommend removing more than just the visible patch.
The goal is to eliminate any microscopic mold growth that may exist beneath or around the affected surface.
A common recommendation is to cut away at least one inch (approximately 2.5 centimeters) around and below the moldy area.
Use a clean knife and avoid dragging the blade through the mold into uncontaminated sections, as this can spread spores.
Once the moldy section has been removed, the remaining cheese may still be suitable for use if it otherwise looks, smells, and feels normal.
This extra margin of removal is important because mold growth is often larger than what is visible to the eye.
Many people make the mistake of simply scraping off the mold. Experts caution that scraping alone may not remove enough of the contaminated area.
When the Entire Block Should Be Thrown Away
There are situations where discarding the entire block is the safer option.
If mold appears in several places throughout the cheese, contamination may be more widespread than it initially appears.
Likewise, if the cheese has been stored improperly for an extended period, has developed an unusual smell, or shows signs of moisture damage, throwing it away may be the better choice.
Another concern involves very old cheese that has remained in the refrigerator far beyond its recommended storage period.