You may have seen the straight rod wax used in temples, burning with black smoke. With the improvement of modern candle industry, this phenomenon has been completely solved. As long as the candle manufacturers choose to use the raw materials that meet the national standards in good faith, the candles produced will not have black smoke.

Only those small factories, in order to pursue low price, buy substandard raw materials, waste oil refining raw materials, or the leftover materials in the production process of regular candle enterprises, that is, waste wax in our industry as raw materials, such candles will appear in the combustion, which is also harmful to the human body. So we suggest that we blindly pursue cheap products.

Some consumers will also find some good candles in the process of using, and occasionally they have cat's eyes. Here I want to popularize them for you. The international standard defines whether the candle is smoke-free or not: if the candle burns without smoke, it is called smoke-free when the surrounding air is not in circulation. Therefore, international standards organizations like SGS in Switzerland will place the candle in an open glass container, which is usually about 20 cm higher than the candle, and conduct the combustion test in a separate room.

If you walk around a burning candle and drive the air flow, the candle will smoke for a short time and then return to normal due to incomplete combustion for a short time. This is caused by the air flow and does not belong to the phenomenon of candle smoking.

Note: inferior candles will smoke in any case, which is due to the use of inferior and cheap raw materials.