[greeneyes]

Well, yes it will, but not usually so uniform as the salt licks. And they certainly look like they have added something to the salt.

[Nepeta]

Well, yes it will, but not usually so uniform as the salt licks. And they certainly look like they have added something to the salt.

Many things are purified based upon the formation of crystals formed of like compounds. The crystals fall out of solution, yielding a concentrated substance. This is how granulated sugar is produced; about 100 such crystallizations are performed, leaving behind molasses.

The salt blocks for livestock or water softeners may not be as pure as granulated sugar (even a concentrated solution of sugar will have a slight yellow coloring). Compare the appearance of table salt/kosher salt/ salt blocks to salt used to melt snow and ice, which usually has a grimy appearance.