curlycoat2
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Plant colorants will fade over time - some faster than others. This is the compromise for knowing that they are completely natural. If you think of a vase of cut flowers some fade and brown faster, same with plants in soap. I have several here that are years old and are perfectly acceptable.
for me purples and blues fade fastest but if you add some salt it holds them better and yes keep everything in the dark.
Butterfly pea does not work in lye based soap, nor do blueberries, raspberries or blackberries. Woad is from France and Italy so will grow for you. Courgettes, nettles, parsley, broccoli, alfalfa, spinach, kale all give green - blend them for longevity. Purple will be your hardest but blue and madder may work you will need to try it in your recipe.
clays do not fade
for me purples and blues fade fastest but if you add some salt it holds them better and yes keep everything in the dark.
Butterfly pea does not work in lye based soap, nor do blueberries, raspberries or blackberries. Woad is from France and Italy so will grow for you. Courgettes, nettles, parsley, broccoli, alfalfa, spinach, kale all give green - blend them for longevity. Purple will be your hardest but blue and madder may work you will need to try it in your recipe.
clays do not fade
Thank you for mentioning me that is very kindThere is a group on FB called soapmaking natural ingredients where they have detailed photo albums with the colors with the added colorants. They also have a countrywide list of suppliers. Also there is a book by Jo Haslauer on natural colors. I have used paprika infused oil to get an reddish orange. I also used avocado seed powder to get a pinkish color. Madder root for a maroonish red and alkanet powder in lye...but that has given me all different colors each time. I am in Dubai, so a lot of the natural colorants are imported, but since we are very close to India, I have a huge range available
*Countrywise