Pine soot ink sticks are especially good for calligraphy and painting landscape. Aging (at least five years) is strongly recommend. 
 Please do not compare our items with something "looks same", and do make sure pay attention on the trademarks. 
For final composition, we recommend items from Tuxi HuKaiWen factory, which is leading the quality and  industry improvement, also keep being widely "imitated". Western users know Tuxi HuKaiWen less because of historic reasons of China's international trading. Inheritor of Intangible Cultural Heritage for ink stick is one of top Hukaiwen. 
Of course, we respect users' habits, we order directly from CaoSuGong from shanghai Ink Factory (old name, former one of top HuKaiWen) , one of top factories in the industry.