1, there are two kinds of piezoelectric photo machines, one is outdoor piezoelectric photo machine, and the other is indoor piezoelectric photo machine. There are two kinds of ink used, one is indoor water-based ink and the other is outdoor oily ink. At present, all water-based inks are environmentally friendly, with low odor, high safety, low volatility and non-toxicity, while oily inks are the opposite, with relatively strong odor.

2. Also, when buying the ink for the photo machine, you must buy the original genuine ink, because the original ink is generally environmentally friendly, which is much more harmful to the human body than some cheap ink with miscellaneous brands. Poor brand-name ink will also affect the printing quality of the photo machine, and you can't enjoy the warranty service provided by the manufacturer. If it is serious, it may cause faults and damage related to the photo machine, which will do great harm to the human body, so don't covet cheap ink with miscellaneous brands.