salt blocks are made of salt (obviously) and salt makes a horse thirsty. This makes them drink more water.
no
Blue blocks contain NaCl (table salt), Cobalt and Iodine. Red blocks contain Salt, Iron and Iodine. Brown blocks contain Salt, Cobalt, Iodine, Iron, Zinc, Copper, Manganese, Molybdenum, Potassium and Magnesium (guessing on the last two minerals) Black blocks contain everything that the brown blocks do, plus Selenium.
Deer are know to lick blocks of salt.
Potassium salt is not better; it is recommended for some diets without sodium.
yes
salt has no affect on rubber
salt blocks
Most horse diets are low in sodium and chloride, hence the use of salt blocks. However, if a horse won't drink enough then it needs veterinary attention.
yes
You mean how to make loose-salt into a salt block. The fact is that it is cheaper to buy the pre-made blocks. The homemade recipes for salt blocks call for things such as bone meal which is not good for horses and many other types of livestock.
Barium Sulfate.