It is commercially available in both the hydrated and anhydrous forms.
Simply heating the hydrates does not afford the anhydrous dichloride.
Clarifying the differences between the anhydrous and hydrate is also important.
Most famously, the anhydrous dichloride is blue, whereas the hydrate is red.
Upon heating, the hydrate loses water and regenerates the anhydrous liquid.
The polymer may then be shaped and hydrated.
An intravenous drip is used to hydrate the patient.
Ethanol is the primary intermediate of the hydration of ethylene.
Hydrates of the additive compounds may also be used.
The test is more sensitive if the sample is hydrated before testing.