Avocado Pit Scarves

I have been experimenting with dyeing silk scarves with avocado pits.  I didn't have much luck last year but I had a lot more luck this year.  One trick is to add a little bit of baking soda to the dye pot to darken the colour.  I've added the scarf to the dye solution in this photo and it's in the pot on the stove:

  I ended up making two scarves.  I also read about using an after rinse in ferrous sulphate solution to get dark blue/purple colours.  So I took one dyed scarf and tied it off with some elastics.  I tied some coins into the ends.  Then I did the after rinse with a very small amount of ferrous sulphate.  The effect was so quick and strong I had to pull it out very quickly.  But here are the results of before and after.  I'm still pleased with the result and will try a weaker solution next time:

Thanks for having a look!