The business model is close to the LED lamp, or the glass-fiber bus. (In Chinese, "用者自負")

Before this, I have checked different things including using vegetable oil to control the total cost. However the drawback is messy cleaning but the fluid, includes the hidden cost so if using this, then you no longer need to do messy thing repeatedly, the fluid is always ready for setting up without problem.

I now am interested with chemical as the business becomes more mature than before. Also if not for mining, I can use this for professional drawing without problem.