Web www.pburch.net
Paula Burch's All About Hand Dyeing
Overview Fiber Reactive Dyes Direct Dyes All-Purpose Dyes Acid Dyes      Food Coloring      Lanaset Dye      Acid Levelling (Kiton) Natural Dyes Vat Dyes Disperse Dyes Basic Dyes Naphthol Dyes Fabric Paints
Index How to Dye with
    Fiber Reactive Dye
How to Tie Dye How to Batik Low Water
    Immersion
Dip Dyeing Washing Machine
    Dyeing
How to Tie Dye
    with Kool-Aid®
How to Tie Dye with
     All Purpose Dye
How to Dye and
    Paint Fabric
    with Light
cellulose fibers:     cotton     rayon and
     bamboo
protein fibers:     silk     wool synthetic fibers:     acrylic     nylon     polyester     spandex other materials...
acetic acid alginate ammonium sulfate baking soda citric acid ludigol mordants salt soda ash sodium silicate temperature synthrapol urea vinegar water softener
Index Batik Mandalas &
    Peace Signs
LWI dyeing Watercolor Rainbow
    Drip-dyes
Tie Dyeing Spray Dyeing Fabric Paints and Markers
The Dye Forum Book Reviews Find A Custom Dyer Old Q&A Blog Blog of Questions
     & Answers (new)
Search Contact me Link here About This Site
Where to Buy
    Dye & Supplies
Mailing Lists Other Galleries Other Informative
    Sites
Additional Links
Index General Dye
    Questions
Fixing Dye Synthetic Fibers Color Choice Dye Auxiliaries Bleaching and
    Discharging
Safety Procion Dyes Acid Dyes Problems Tying Miscellaneous
Facebook: All About
    Hand Dyeing
Twitter @HandDyeing Google+
Procion MX Dyes Jacquard Acid Dyes Other Dyeing
    Supplies
Fabric Paints, Dyes,
    Books, and DVDs

You are here: Home > All About Hand Dyeing > FAQ > Auxiliary chemicals > Ludigol

Advertisements

Sodium 3-nitorbenezenesulfonate

ludigol

Why do some dye recipes call for Ludigol (or Ludigal)? What's it used for?

Ludigol is a brand name for m-nitrobenzene sulfonic acid, sodium salt. (Thanks to Doug Wilson's wonderful Dyes and Dyeing Glossary for this definition.) It is sold by PRO Chemical & Dye as Chem Flakes, as Ludigal F by Dharma Trading Company, and and as Ludigol F by Jacquard Products (Rupert Gibbon & Spider).

You do not need to use Ludigol for room-temperature dyeing. Its use is to protect fiber reactive dye from being chemically reduced, which is generally considered to be significant only at higher temperatures; its use is optional at room temperature. Its effect, when it is truly needed, is to make dye colors brighter, improving the yield by preventing their inactivation before they can bind to the fiber.

Since monochlorotriazine dyes (Procion H type dyes) must be steam-set, PROchem says that Ludigol is essential with this class of dye. Dichlorotriazine (Procion MX type) and monofluorotriazine (Cibacron F, sold by PROchem as Sabracron F) dyes can be used at room temperature, but they can also be steamed or microwaved. If heat is used with fiber reactive dyes, Ludigol is definitely recommended, though you can get by without it. G&S Dye says that Ludigol is "Essential for achieving very sharp edges on painted fabrics."

The only time I've ever used Ludigol myself was after someone at one of the smaller dyehouses told me it could be used as a preservative so that Procion MX would stay 'good' in solution longer, which would mean that somehow it would quit reacting with the water molecules to become inactivated by hydrolysis. I immediately bought some, and ran some tests of my own. To my sorrow, it turned out to be completely untrue. Ludigol did not extend the lifespan of Procion MX in solution; if anything, it slightly accelerated the breakdown. To keep Procion MX dyes in solution for up to a few weeks, you can only refrigerate the dye mixtures, but for much use of stock solutions (which are handy for avoiding exposure to potentially allergenic dye powder), you need to switch to less reactive dyes, such as Cibacron F (Sabracron F), Drimarene K, or Remazol (vinyl sulfone) dyes, or steam-set dyes such as Procion H.

I've been thinking I should use Ludigol when microwaving Procion MX type dyes, ever since hearing of Phil Jones's great results, but, as of this writing, I've never gotten around to it. My results have been satisfactory without it.

PROchem, interestingly, suggests using Ludigol in low water immersion dyeing if you live in a smoggy environment. I don't know which pollutant they are concerned about, in this case, nor how significant an impact it may have.

Jacquard Products recommends using 1 US tablespoon (15 ml) per quart (1 liter) of dye solution. PROchem's LWI recipe calls for 1 level teaspoon (5 ml or 2 grams) of Ludigol per quart (liter).


Advertisement



see list of answers to other FAQs

 Home Page     Hand Dyeing Top     Gallery    About Dyes    How to Dye    How to Tie Dye    How to Batik    Low Water Immersion Dyeing    Sources for Supplies    Book Reviews    Other Galleries    Groups    FAQs     Custom Dyers    Forum    Q&A blog    link here    search    contact me  


All of the pages on this site are copyright ©1998‑2017 Paula E. Burch, Ph.D.

This page was created: March 23, 2003
Last updated: May 29, 2007
Downloaded: Thursday, August 17, 2017