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.
They sink and they float it just depends on the almond.
It looKs like mold
it would turn a grayest color and have an odor.
Cyanide smells like bitter almonds when it is present in almonds.
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.
The scent of almonds is often described as sweet, nutty, and slightly floral.
spoiled iced tea smell sour
Cyanide has a bitter taste and does not taste like almonds. The belief that cyanide tastes like almonds may come from the fact that some compounds in almonds and cyanide share a similar smell. However, cyanide is extremely toxic and should not be ingested.