Paar nõuannet metallipeitside kasutamise kohta, mis viimasel ajal on silma jäänud, osaliselt Ravelry Natural Dyeing grupist.
Raud- ja eriti vaskvitriol mõjuvad vee-organismidele väga toksiliselt (ammoniaak muuseas ka). Seega peaks igal võimalusel vältima raua ja vase peitsivee kanalisatsiooni kallamist, sest enamik veepuhastusjaamu kasutab baktereid reovee puhastamiseks. Selle asemel võib peitsivee valada pigem õue, kust metallid jälle aineringesse lähevad või mullaosakeste külge kinnituvad.
Oluline on kasutada õige kogus peitsi vastavalt lõnga kaalule - sellisel juhul kinnitub enamik peitsist lõnga külge ja vette jääb vähe. Kui oled lõnga raua- või vasevitrioliga eelpeitsinud, siis võib järelejäänud peitsivee alles hoida ja hiljem järelpeitsimise näol vähesemal määral värvi muutmiseks kasutada. Seda ma ei tea, kas raud- ja vaskvitrioli peitsivett korduvalt kasutada saab - nii et lisad aga iga kord potti veidi peitsi juurde ja peitsid samas vees korduvalt. Maarjajää ja kaaliumdikromaadiga teevad mõned värvijad küll nii.
Some advice on using metallic mordants I have read about recently, some of it is from Ravelry's Natural Dyeing group.
Iron and especially copper mordants have a very toxic effect on aquatic microorganisms (ammonia too, by the way). So it's important to avoid pouring water containing mordant down the drain, because bacteria are usually used in sewage cleaning systems. Instead, you can pour the used mordant bath outside on the ground, where the metals enter the biogeochemical cycle or remain inert by adhering onto soil particles.
It's important to use the correct amount of mordant, considering the weight of yarn or fiber. This way most of the mordant attaches to the yarn and very little is left in the bath. If you have premordanted yarn with iron or copper mordants, you can reuse some of the mordant water for colour modifications. I don't know if you can reuse iron and copper mordant baths several times, by adding some more mordant every time before use. I have read about people doing it with alum and chrome mordants, though.
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I have re-used iron premordant bath and it works that way, too. I suspect copper would work too, and that would be a good way to use copper mordant, if you want to do it. It does give nice greens with otherwise yellow dyestuffs and several books say that copper makes many colors very lightfast, so that is another plus for using it. I haven't used copper for many years because it is more poisonous than alum or iron, but re-using the bath would be a good way. I sometimes miss the colors it gives.
I don't think I will use copper as a mordant, at least not now. But I will try to make copper modifier by soaking copper piping in vinegar solution. I can use it while dyeing outside during the summer. I don't want to use copper solutions when I dye in the kitchen.
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