The seed prevents the guacamole from oxidizing, you can use plastic wrap on the surface to also help prevent this, or you can fight the enzymes that would oxidize by adding lemon or lime (the acidity kills the enzyme) and thus also avoid the color change.
Avocados are hard to cut open when they are not ripe because the fruit has not softened enough for the knife to easily slice through the skin and flesh.
The lettuce does not turn brown due to it being cut with a metal knife. It turns brown due to oxidation.
no they will not turn brown
no, kiwi doesn't turn brown after you cut it
when cut and exposed to air. lemon prevents browning. when extremely ripe they turn brown.
Sweet potatoes turn black when cut due to the enzymatic oxidation process. When the flesh is exposed to air, enzymes like polyphenol oxidase react with phenolic compounds, leading to the formation of dark pigments. This reaction is similar to how apples and avocados brown when sliced. To prevent this, you can soak the cut sweet potatoes in water or lemon juice to slow down the oxidation.
Yes.
KumaraSweet PotatoAubergine/Egg PlantPotatoYou can prevent most of these from going brown by placing them under water.
Yes, jicama can turn brown when cut, similar to many other fruits and vegetables. This browning occurs due to oxidation when the flesh is exposed to air. To minimize this effect, it's best to keep cut jicama covered or submerged in water, and you can also apply a little lemon juice to the cut surfaces.
I would think the apple would be rotten. I've never seen the inside of an apple that is naturally brown when cut open unless it was rotten.
Turn the saw off.
Mangoes tend to stay the same color when cut. If you cut them and do not eat them immediately or store them properly they may discolor slightly, but not on the same level as an apple.