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select t1.*, t2.*, t3.dyestuffs as p_dyestuffs from products t1 left join product_details t2 on t2.parent_id=t1.id left join products_dyestuffs t3 on t1.id=t3.parent_id where t1.id='15' and t2.lang='en' and t3.lang='en'

Woad

Isatis tinctoria L.
Colors Obtained
Dark Blue, Blue, Green
Dye Ingredients
Indican, isatin B.
Dyer's woad, or simply woad, is a biannual plant. In the first year, it only develops a rosette of leaves close to the ground. In the second year, it grows a stem of about three feet with lots of small, dark yellow flowers in clusters. The arrow-shaped leaves that surround the stem are bluish-green and contain the indigo precursor substances isatan A and B, indoxyl-derivatives. Isatans differ from the indican in Indigofera tinctoria and other indigo plants only in that instead of glucose being bound to the indoxyl,they are bound to D-ribohexo-3-ulopyranosides. When this is split from the isatans, however, the yellow indoxyl and sugars result, just as with the splitting of indican.