Tuesday, 31 May 2011

hallelujah! Success with the Fructose Indigo vat

You can see that  one half of  this little vat is thick yellowy solid deposit. The liquid half  is a deep orange almost red.  I took 100ml out of this yesterday which is why there appears to be a cloudy blue bit in fact is empty with a bit of a deposit on the glass. .

 Today thanks to help  from Debbie and Jane  and Leena I managed the fructose indigo vat.

I heated 3 litres of water to 80 degrees C, tipped the contents of the little 400ml  vat in and stirred. Within 30 seconds  flakes of blue appeared on the yellowy  looking surface then a thick blue indigo flower.  After ten  minutes the colour of the water under the filmy surface was  a lime green then a orangey yellow. ( the colours of this type of vat seem different to that of the chemical reduction vat using thiourea dioxide.

The vat was at pH 10 and dye dyed well  the temperature dropped to 45 degrees,d dying cotton velvet then a length of merino tops a pale blue. . I dipped the cotton velvet into the vat 3 times and got a slightly deeper blue but I don't seem to have photographed it.  You don't seem to need to dip the fibres for very long.  Quite literally in and out. The colour change is either very slow or the stuff comes out blue and I need to go back to this vat and see if I can work out why this is.  Is the stuff coming out blue in the vat longer?  And as you can see there is a yellowy scum on the surface which washed off which I assume is  the deposit form the bottom of the vat.  I wonder if these fibres will crock.
Nb It would seem that you can make a stock solution just as we do with the thiourea vat which  could I think be very useful 


  1. I'm so glad you succeeded! The next question is the fastness, and for me how my wool will handle the high pH/temperature. I have now fructose, so we'll see how this works for me in a few days:)
    Thanks Helen.

  2. Hi Leena
    I agree with you - we need to test fastness. This vat is also slightly different in that the colour of the vat is different , the smell certainly is! Yesterday I dyed wool in the last of the vat and it came out an extraordinary green colour which has not changed. I have got a slightly deeper blue on the cotton velvet I dyed but otherwise the colour is s light bright blue. I will be interested to see how you get on. Don't forget it is essential to use calcium hydroxide Michael Garcia said it was the only alkali that was active enough. However some experiments to test that would interesting.

  3. Well done... I'm looking forward to trying this out...

  4. I warmed up my vat yesterday and stuck some silk in that had had one dip and was a lovely turquoise. I was distracted by various things and forgot all about it till this morning - it is significantly darker, though I haven't rinsed it yet.

  5. The last lot of wool I dyed in my vat was green! Very puzzling but my cotton velvet was slightly darker after 3 dips. Need to experiment more.