If they have been spoiled by an insect infestation, the insect damage and webbing will be very obvious.
Some molds will appear as dark or discolored spots.
If the nuts are rancid, that won't be seen but can be caught via smell and taste. Hopefully, your nose will pick it up before you taste it.
Bacterial contamination cannot be seen.
Almonds generally float in water because of their low density. This can be useful for sorting out almonds that are less fresh or may be spoiled.
It looKs like mold
it would turn a grayest color and have an odor.
potassium cyanide is a poisen that is distinguised by its smell and taste of bitter almonds
Cyanide poisoning can make the breath smell like almonds.
It tastes like a candy cane. ?? Marzipan is made of ground almonds and sugar, so it tastes like very sweet almonds.
tastes like spoiled tuna
By Spoiled, I am going on you mean unfertilized. Most eggs will be fertilized, while the ones that are not, will turn white in most cases, and develop a fungus on them. The parents will pick those away usually.
spoiled iced tea smell sour
it was be spoiled and chunks of gloppy milk.
The smell of almonds can be indicative of the presence of hydrogen cyanide, or cyanide gas, which has a bitter almond-like scent in low concentrations. However, there are no explosives that naturally smell like almonds.
It will have a very spoiled smell and it will taste very bad. Be extremely careful because it will not change color. It will look like it is not spoiled. However, do not be fooled. It is extremely dangerous. Don't be cheap. Spill it out immediately or if you do not you will be sick for days and you could possibly die. Spoiled soybeans are not to be played around with, deadly bacteria develop and you will become extremely ill.