to make the dye.
you need to gather the berries and mash them up.
put them in a pan and boil them.
once boiled, remove from the heat and simmer about 30 mins till cool.
now mix some vinegar into the dye and mix well.
let the mix settle.
now you can use the dye.
don't throw out those berries. You can make jam or tart toppings!