I really like the effects i get with potassium permanganate, but there’s not a lot of info available, online, or in old books, when it comes to using it with cloth. Most sites tell you how to get rid of the “stains” when you are working with it, in either metal or wood applications, but not how to keep it! I *think* we might have done something with it in the textile arts program in the early 90’s at Capilano College, but if we did, i either took few notes (usually when i wasn’t that interested!), or i threw them out in a long ago purge…….
First of all, this stuff is actually Scarey Dangerous. Yes, very, no exaggeration, in application, storage and with other chemicals. It can be explosive, toxic, mutagenic, corrosive. I cringe when i see people sticking their hands in vats with no protection, but this one in particular made me yell at someone during res who did just that. But it’s also used as an anti-fungal, an antiseptic, water purification, in garden applications, for livestock use, and in science labs for staining specimens and slides.
It’s not a “natural dye”: it’s a chemical compound. So why use it if it’s so freekybeaky? Because i like the warm browns it can give, i like the way it chases (discharges, technically) indigo, i love the effects with rust and ecoprints. Respect for what we use as dyers, whether chemical or natural, can go a long way though and i have always stressed safety first in any of my own work, and certainly when i have taught classes. So i will use it, and with pleasure! (The few sites that have had any information make me shake my head too, as they blithely swish things around with bare hands……..)
I know brown is not an exciting colour to most people, and most natural dyers are going to use walnuts, chestnut, cutch or sequoia, or combine different dyebaths with various mordants and modifiers to get brown when they do want it 🙂 (And i have, and do that as well. ) You’re not going to find potassium permanganate for sale on any dye house sites though, chemical or natural. I searched through chemical suppliers, university science sites, and finally water purification shops, and bought mine at a local supplier for “HVAC, Water Treatment, Fluid Handling and Conservation Industries .” (I’ve heard it also referred to as “Condy’s Crystals”, an archaic name for it, and supposedly available at pharmacies/”chemists”, though i suspect that’s more in the UK than anywhere nearby!) And i asked for and got the 6 page MSDS that should go with ALL chemical use. (See that first link in this post.)
Initially, it’s expensive. I just about had a bird when i called and asked about the size they had on the website (10lbs)–$169.00!!!! The gentleman on the phone said though that they did have smaller 5 lb packages, at slightly less than half of that amount. In use though, it’s cheap, cheap, CHEAP. At 1/4 to 1 TSP per litre of water, it’s going to last a looooooooooooooooooooooooooooong time, great Cost Per Wear!
ALL “mixing” of this will be done outside in a corner of the back40, wearing gloves, respirator and safety glasses. And lest anyone think i am totally looneytunes using this potentially bombwhacko product, a lot of textile program school scenarios have a vat of it in the wet studio, and no one has reported any Incidents. ALL dyeing should be handled with respect, safety and care.
I remember there are a few other things i can do with “potperm” and cloth, so am off to refresh my memory, and make my own (SAFE) rules for use.