If a plant and a factory can make exactly the same blue molecule, how would a buyer ever know which one filled the sample jar? Chemists have lived with that puzzle since 1897, when the first commercially viable synthetic indigo reached the market. At the 1905 Nobel ceremony, where Adolf von Baeyer received the Chemistry… Continue reading What Should Buyers Ask an Indigo Powder Manufacturer About Private Label, Testing & Henna Blending?