Wednesday, October 07, 2009

more bleach and experiment

Yesterday Kelly and I used some more bleach on black Kona and discovered something new. According to a recent workshop I took, Kona discharges to rust/orange when using bleach but we managed to discharge it to this color:
And I don't know what you call it, but to me this is close to white. Each strip of fabric is 12" x 44" and had 6 knots in it. Knotting was not so bad to do, but unknotting wet fabric is no fun at all.By the way, the Kona is from JoAnn's. On this picture you can see how light it is compared to an earlier discharged piece of Kona:
Of course we wanted to know how this light color was achieved and after some thinking we came to the conclusion that either the strength of the bleach bath and/or the time the fabric was in the bath must have had to do something with it. We had not timed how long our pieces were in the bleach bath. To have all the information, after the bleach bath, the fabric was rinsed and soaked in anti-chlor. All the time it was knotted. When we unknotted the fabric - we each had around 7 strips with 6 knots each in it - the smell of bleach was still present. Unknotting took quite a long time. Neither of us is a chemist, but we came to the conclusion that in spite of the rinsing and the anti-chlor the bleach had been active all the time, which must have been between 1 and 2 hours.
This called for an experiment. We cut strips of fabric and made 4 bleach baths. One for 100%, one for 75%, one for 50% and one for 25%. The time we left the strips in the bleach bath was 30 seconds, 1 minute, 3 minutes and 10 minutes. On this picture you can see that the longer the fabric was in the bleach bath (bottom row) and the strongest the bleach bath was (left column) the lighter the fabric discharged to.
On this picture you see a strip which we did not timed, but it was in the bleach bath for more than 1 hour. You can also see, that the centre of the middle strip - which was knotted - continued discharging after rinsing and anti-chlor.There is one thing we will only know after some time and that is whether anti-chlor is strong enough to stop the effect of a 100% bleach bath. For us this experiment was very interesting


Margeeth said...

Chlorix is heel hardnekkig, zolang je het nog ruikt is het nog actief.

mia de vos said...

Die Kona stof doet je versteld staan, je zegt het telkens dat het mooie resultaten geeft en dat is te zien, vooral de lappen die je geknoopt hebt zien er mooi uit.

Thelma said...

Such an awesome experiment with the bleach. Love the results. I wonder if you should leave it in the antichlor for a longer period of time to stop the reaction?

Becky S. said...

Very nice discharged pieces! The string, or whatever you used to knot the fabric was probably acting as a wick, holding the thiox or bleach in it. Since it remained in contact with the fabric, the fabric continued to discharge.
Maybe you could try untying first and then putting the fabric into antichlor, and leave it there longer? A good rinse in warm water after the antichlor, then washing might help to git rid of the odor.
At any rate, it looks like you had fun, which is the most important thing, right?