Minerals turmeric

The coloured materials most frequently added are gamboge, dragon s blood, turmeric, indigo, and especially artificial organic colouring matters. For some varnishes mineral colours are used, such as ferric oxide, white lead, minium, lamp black, etc. 

Indicator papers frequently aid in the identification of chemicals. Strong mineral acids are acid towards methyl violet or thymol blue papers, moderately strong acids react acid towards Congo paper, and very weak acids are acid towards htmus and azolitmin paper. Strong bases show an alkaline reaction with turmeric or tropeolin 0 paper, medium strong bases with phenol-phthalein, and very weak bases with litmus or azolitmin paper. These papers are not recommended for use in quantitative analysis. ... 

White, bulky, amorphous powder d 3.25. insol in water sol in mineral acids when freshly pptd less sol when aged. It colors turmeric paper brown. 

Christian Gottlob Gmelin travelled in France, England, Norway, and Sweden (where he worked with Berzelius) and was professor (1817) of chemistry and pharmacy in Tubingen. He worked on lithium compounds (see p. 152), mineral analysis, etc. He mentions the turmeric paper test for boric acid, discovered artificial ultramarine independently of J. B. Guimet (1826), and translated the first three volumes of Berzelius s Jahres-Bericht (see p. 146). 

Medicinally rich herbal formulations using plant material, minerals and oils like, turmeric, Myraballm, castor oil, sea salt, etc., are used for dyeing of the fabric or yam. The medicinal qualities of the herbs are retained by immersing the plant material directly in the dye bath. 

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