There are two kinds of courts in this country -- state courts and federal courts. Following is a discussion of key differences between the state and federal court systems. State and local courts are established by a state (within states there are also local courts that are established by cities, counties, and other municipalities, which we are including in the general discussion of state courts).
Iron Compounds. A combination of iron and other elements make up important products that are found very useful in a lot of ways. Iron chloride is an important compound that is used in treating sewage systems. It is also used as dye for cloth. It is also used as a coloring agent for paints.
Ferrous sulfate was used in the manufacture of inks, most notably iron gall ink, which was used from the middle ages until the end of the eighteenth century. Chemical tests made on the Lachish letters [circa 588/6 BCE] showed the possible presence of iron (Torczyner, Lachish Letters, pp. 188â95).