Ekstraksi Tanin Dari Kulit Buah Manggis Sebagai Bahan Dasar Tinta Spidol Yang…

Ink markers are tools that often used for writing on the whiteboard. It's different from chalk, ink markers have high levels of VOC (Volatile Organic Compound) and very harmful to health due to the xylene content in it. One of the chemical constituents in mangosteen peel is tannin. Tannins that contained in mangosteen peel can be processed back into the basic ingredients of ink marker that safe…