MasterChinese - Yi De Ge Chinese Calligraphy Sumi Drawing Black Liquid Ink (500g) Tested by an accredited laboratory in the USA. Safe to use (more below) Economy size: Yi De Ge 500g (16.9 fl oz) - Brand: Yi De Ge since 1865 Better quality ink for practice or work of art (see more below) NEW packaging SAME great ink No need to add water. No foul smell: Because it's authentic. Notice the uniformity of the black ink color when it is dropped in the water. <span class="a-text-italic">Level: Intermediate</span>. This ink is not of the lowest quality level ink that can be used onlyfor practice purposes. It&#039;s a better quality ink that&#039;s good for practice or art display purposes. The ink has been tested by an accredited laboratory in the USA. The content satisfies the USA consumer product safety comission requirements. It&#039;s safe for children or adults. No foul smell. Has a special spill proof cap protection to protect users from ink spilling No need to add water. But depending on you taste, you could add water. If you add water, please do so in a separate container. DoNOT put the leftover back in the bottle After writing/drawing, it&#039;sbetter to let your work sit for 24 hours before hanging (depending on the humidity of your place and the complexity of your art work, of course). For practice/classroom purposes, a few seconds/minutes wait is enough. In the winter, keep the ink in temperature of 10C (50F) or above. If the ink got frozen, immerse the bottle in warm water.