"The brand of oxygen source has been made for a long time. If it is purchased from a regular merchant, it should not be fake. Oneself can also use the simplest method to distinguish the truth and falsehood of volcanic mud and the source of oxygen. Here are some suggestions for your reference:

Experiments to distinguish the quality of volcanic mud (an oxygen source);

1. In terms of specific gravity, volcanic mud, as an oxygen source, has a light specific gravity and a high volcanic ash content.

2. Water addition ratio: The water addition ratio of a good oxygen source volcanic mud is close to 1: 1. According to the mechanism requirements, the water addition ratio is 0.8: 1.

3. The difference between wet material and dry material is that the color difference between wet material and dry material on the wall is small.

4. Handle: volcanic mud with good oxygen source, volcanic mud with soft handle and poor oxygen source, with rough and hard handle, like cement and external sandstone.

When it meets water, it becomes mud. When the oxygen source volcanic mud on the rock wall is saturated, it can be reduced to mud.

6. smell it. A good source of oxygen, volcanic mud, has no pungent smell, but a faint earthy smell.

7. Spray water with a watering can, and the faster the water is absorbed, the more it is, indicating that the oxygen source volcanic mud has a better respiratory function.

8. Look at the color. Good diatoms are soft and not dazzling, and the color is very positive. It won't have a bright color, unlike paint. "