Turmeric (Curcuma longa) is a rhizomatous herbaceous perennial plant of the ginger family, Zingiberaceae. It is native to tropical South Asia and needs temperatures between 20°C and 30°C (68°F and 86°F) and a considerable amount of annual rainfall to thrive. Plants are gathered annually for their rhizomes, and propagated from some of those rhizomes in the following season. When not used fresh, the rhizomes are boiled for several hours and then dried in hot ovens, after which they are ground into a deep orange-yellow powder commonly used as a spice in curries and other South Asian and Middle Eastern cuisine, for dyeing, and to impart color to mustard condiments. Its active ingredient is curcumin and it has a distinctly earthy, slightly bitter, slightly hot peppery flavor and a mustardy smell. you can make yellow ink by combining a couple of common household items. Colorful inks can be derived from naturally occurring pigments. The deep golden color of ground turmeric spice creates an ink with a bright yellow hue that has the ability to glow under ultraviolet light. Fully mixing and filtering the natural ink gives it a more even yellow color. Save money on art supplies and give your colors a personal touch by making your own bright yellow turmeric ink. Add the turmeric, alcohol and marble to a small baby food jar before securing the lid carefully. Use stale turmeric that was ground more than six months ago to reduce the smell of the ink. Shake the baby food jar vigorously for 20 seconds to thoroughly mix the ingredients. Allow the mixture to rest inside the sealed jar for a couple of hours. Insert the narrow end of a coffee filter cone into the opening of a second baby food jar. Pour the turmeric and alcohol mixture into the coffee funnel slowly so that the level of liquid in the cone does not rise above the rim of the jar's opening.