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Copper sulfate, when used as a mordant is similar to iron in darkening the dye colors but it is less harsh on the fibers. Copper sulfate is sometimes listed as copper sulfate or copper vitriol. Copper sulfate can be used on all fibers and usually improves the color fastness of plant dyes. Copper sulfate tends to make colors greener or browner in tone.

Iron can be used as a modifier or a mordant. It can be used on all fibers and makes colors darker in tone. It also increases lightfastness and washfastness of the dyed project. This iron powder is light green and food grade. Too much iron can harshen the hand of protein (silk, wool) fibers, so use sparingly. Iron Sulfate may also be used as the reducing agent in a traditional indigo fermentation vat, often called the “Copperas” vat. It is also possible to create an iron acetate mordant by combining iron and acetic acid. 

Lac is the scarlet resinous secretion of a number of species of lac insects, of which the most commonly cultivated species is Kerria lacca. Cultivation begins when a farmer gets a stick (broodlac) that contains eggs ready to hatch and ties it to the tree to be infested.[1] Thousands of lac insects colonize the branches of the host trees and secrete the resinous pigment. The coated branches of the host trees are cut and harvested as sticklac. The harvested sticklac is crushed and sieved to remove impurities. The sieved material is then repeatedly washed to remove insect parts and other soluble material. The resulting product is known as seedlac. The prefix seed refers to its pellet shape. Seedlac which still contains 3–5% impurities is processed into shellac by heat treatment or solvent extraction.
Logwood is derived from the heartwood of the logwood tree (Haematoxylon campechianum). It yields deep rich red purples to orchid blues depending on concentration and type of mordants used. Logwood has been use a dye source since the 16th century. The logwood tree is native to mexico, central america and portions of South America and India. Deep blacks can be obtained with the use of ferrous sulfate. Logwood develops best in a hard water dye bath.
Gallnut or Oak Gall is used to mordant cellulose fibers and fabrics before the alum mordant is used. Alum does not combine as readily with cellulose fibers as it does with protein fibers.

Tannin has a great affinity with cellulose fiber and once mordanted with tannin, alum combines well with the tannin-fiber complex. 

Gallnuts from the oak tree are the earliest and richest source for natural tannin. They are produced by insects who deposit their eggs in small punctures they make on young branches. As a protection, the tree excretes a tannin rich substance that hardens and forms into a gallnut. These are collected and ground for use as a tannin mordant.

Gallnuts are used in the leather tanning industry, and for in some medicines. 

Use at 6-8% WOF.
Pomegranate extract and powder comes from the rinds of pomegranates Punica granatum. It is high in tannin and improves the light and washfastness of any dye with which it is mixed. It can be used as both a dye and a mordant. The age of the fruit affects the color of the dye: the less ripe the fruit, the greener the yellow. 
For use with synthetic dyes. In tie-dyeing and direct application dyeing - urea helps retain moisture in fabric throughout batching process.

Eastern Black Walnut (Juglans nigra) is obtained from the bark of the tree and also from the green husks of the fruit. Walnut is a sustainable dye source that can used with or without a mordant.

This dye powder is produced from the green hulls of locally sourced walnuts in the North Georgia Mountains. The hull is removed, dried and ground into a medium fine powder.  It can be used alone to produce warm deep taupe's or to give extra depth in combination with other dyes.