Put your avocado pits and skins into the pot and fill the pan with water. Bring it to a slow simmer, this helps kill any bacteria from the avocados. It is a test and see process, after a few hours dip a paper towel into the dye to check on the colour and then turn the heat off again. You can repeat this process multiple times over the course of a couple of days and add more pits if you want as you go. Be careful not to over-heat the dye as it will turn the colour brown.
Once it’s closer to the colour you are aiming for, add a little bicarbonate soda to the dye to make a redder shade, or alternatively you can experiment with adding white vinegar for a more yellow shade.
Another alternative that I use more and more is to strain off the dye and start again. Discard the old dye and heat up the skins and pits again with fresh water and repeat process. This will give a cleaner tone second time around. There is a lot of dye to give in the skins and especially pits. So don’t be worried about starting again.
Meanwhile, soak your fabric in cold water, removing any air bubbles and making sure all the fibre gets opened up by absorbing the water, this will give a more even colour when it comes to the dyeing step.