Whole Butterfly Pea Flower. Simple and pure: 100% Dried Blue Butterfly Pea Flowers. Bring a bit of colour to your products with this natural colourant. Colour-changing and easy to use: With a natural hue of blue, this tea changes to violet or purple with lemon or other acidic liquids. Direct from a farming friend in Thailand, we bring you this butterfly pea flower creates a deep, dark blue colour in boiling water. Add 3-4 flowers to hot water for blue effect. The deep blue colour takes about 5 minutes, stirring occasionally will speed the process. Honey . Add lemon to change liquid to violet. It is possible to put the flowers in cold water for the blue effect. Add 6-7 flowers per litre bottle. Leave overnight. Natural colouring for various products. Can be used as a natural clothing dye.