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2. Indigo dye - Wikipedia

   en.wikipedia.org/wiki/Indigo_dye

   Indigo dye is a dark blue crystalline powder that sublimes at 390–392 °C (734–738 °F). It is insoluble in water, alcohol , or ether , but soluble in DMSO , chloroform , nitrobenzene , and concentrated sulfuric acid .

3. Scilla siberica - Wikipedia

   en.wikipedia.org/wiki/Scilla_siberica

   The flowers are usually blue, but those of Scilla siberica var. alba are white. The stamens of Scilla are separate, unlike those of the related genus Puschkinia, which are fused into a tube. The pollen is dark blue. After flowering, the flower stems become limp as capsules (pods) mature. At maturity, the capsules become purple and split open ...

4. Ceiba speciosa - Wikipedia

   en.wikipedia.org/wiki/Ceiba_speciosa

   Ceiba speciosa, the floss silk tree (formerly Chorisia speciosa), is a species of deciduous tree that is native to the tropical and subtropical forests of South America.It has several local common names, such as palo borracho (in Spanish literally "drunken stick"), or árbol del puente, samu'ũ (in Guarani), or paineira (in Brazilian Portuguese).

5. Jacaranda mimosifolia - Wikipedia

   en.wikipedia.org/wiki/Jacaranda_mimosifolia

   Jacaranda mimosifolia is a sub-tropical tree native to south-central South America that has been widely planted elsewhere because of its attractive and long-lasting violet-colored flowers. It is also known as the jacaranda, blue jacaranda, black poui, Nupur or fern tree.

6. Trachelium caeruleum - Wikipedia

   en.wikipedia.org/wiki/Trachelium_caeruleum

   Growing to 120 cm (47 in) tall by 30 cm (12 in) wide, it is a woody-based erect herbaceous perennial, with oval leaves and dense cushions of violet-purple flowers in summer. [3] The specific epithet caeruleum means "dark blue". [4] In temperate climates this plant is usually grown as a half-hardy annual for summer bedding schemes or planters.

7. Natural dye - Wikipedia

   en.wikipedia.org/wiki/Natural_dye

   Black Walnut or Black Walnut hulls (brown, black, source of tannin) Catechu or Cutch tree (brown) Gamboge tree resin (dark mustard yellow) Chestnut hulls (peach to brown) Ebony leaves (black) Himalayan rhubarb root (bronze, yellow) Indigo leaves (blue to purple) Kamala seed pods (yellow) Katuray (red) Madder root (red, pink, orange)