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Home » forums » Indigo, vat dyes, and sulfur dyes

Thiourea dioxide buildup in indigo vat

A question came up recently in one of my classes that I don't know the answer to but would like to!

The question is "Does thiourea dioxide buildup in indigo vat over time to an extent that the vat needs to be disposed of and the vat remade? Or does the thiourea dioxide exhaust over time?"

As long as the vat is dyeing well and ingredients properly balanced my vat seems fine (over 2 years now). I have of course added water, indigo and all other chems as needed but I have heard that one needs to dump it every now and then (when?). I like to know the chemistry behind such statements but often these things are said/posted without such info whether or not they are true.

Nice to know I can come here and ask the question when I am lacking in the chemical understanding of it all.

Thanks-

By shiborigirl at 2012-06-05 11:52 | Indigo, vat dyes, and sulfur dyes | login or register to post comments | previous forum topic | next forum topic

nevermind...

figured it out.

By shiborigirl at Tue, 2012-06-05 15:56 | login or register to post comments

indigo vats

So, what did you conclude?

I was thinking about the reactions of thiourea dioxide, but hadn't gotten anywhere yet.

-Paula

By pburch at Tue, 2012-06-05 18:11 | login or register to post comments

indigo chem vats

paula-
i checked with a reliable source who told me :
..the thiourea dioxide decomposes to urea and sulfur dioxide to work. The urea is not harmful to the vat and sulfur dioxide is a gas that you notice the smell."

i'm not sure what, if any, complications might arise from a buildup of urea in the vat, but as far as inhibiting dyeing, it doesn't seem to be an issue. as with all indigo dyeing, rinsing well is key.
right now, i am enjoying my natural fermentation vat greatly!

glennis
www.shiborigirl.wordpress.com

By shiborigirl at Sat, 2012-07-07 12:05 | login or register to post comments

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