Ferrous chloride, solution is the greenish-white crystalline solid dissolved in water. It is used in pharmaceutical preparations, for sewage treatment, and as a mordant (which fixes dyes so that they will not run) in textiles. It serves as a coagulation and flocculation agent in waste water treatment as well as odor control. It is also used as a precursor to make various grades of hematite that can be used in a variety of pigments. It is the precursor to hydrated iron (III) oxides that are magnetic pigments.
Sales Specification

Appearance: Green to Dark Color Liquid
Ferrous Chloride(FeCl2): 18% -32%
Fe(II): 8%-14%
Typical Analysis

Ferrous chloride as FeCI2: 28.0%-30.0%
Specific Gravity @ 68 F: 1.312 g/ml
Free Acid: 0.50%Max
Ferric Chloride as FeCI3: 3300 ppm Max
Packing

In 2995 LB Tote
DOT Transportation Information:

UN No.:UN1760
Proper Shipping Name: Ferrous Chloride, Solution
Hazard Class: 8
Packing Group: II
RQ

The Reportable Quantity (RQ) under CERCLA is 100 lbs