Physically, cone incenses are different to stick (cylinder) incenses
A stick incense is evenly distributed so once lit up, its burn time is stable from top to the bottom. Depending on the manufacturer, its weight and size may vary. The below example is from our own incense, 0.14g per stck
Cone incense is different, as per cone shape, the weight is 1.97g, the 'fuel" (incense content) is 14 times more than the stick
So what happened when you lit the cone incense?
Have you experienced the cone incense turned off in midway? If so please read on
In this example only, we will divide the cone incense into 4 parts per below
The trick is to ensure part 1 is covered in flame first before putting it out leaving incense burn without the strong flame
tilt the incense down to increase the burn area, ensure the incense is lit up with a strong flame. Wait for 5 to 10 seconds before putting the flame out. For any reasons, if your cone incense is off, simply re-light it with care, watch out for your finger. If it is unsafe to light the incense as it is too short, please use a multi-purpose lighter with a long wand
This is the perfect light.
Do you see the downflow smoke which only happens halfway through the burning?
If you set up correctly, the incense will burn completely without waste, for example, like the one below
So how does a backflow incense work?
In general, smoke from combustion (caused by heat) will rise up as hot air is less dense than cool air.
So to make smoke descended, an absence of convection is required. The below video will explain the point
The bottle acts as a cone incense
The paper roll acts as a passage of smoke of the cone incense.
As you see, from the flame (heat source), the smoke rise but as the smoke travels into the bottle which has no warm air inside, it sinks. This happens exactly inside the cone incense.
Apologise for the hand drawing diagram of ours. The backflow smoke can be explained per the above diagram
The principle of Atmospheric Pressure (Air Pressure( which we learned from high school.
First, let's have a quick look at how the structure of the cone,
The 3.5cm cone-shaped incense is mainly solid with a small hollow of 2 cm depth passage per below
The depth of the hollow part is approximately halfway through the incense. It means the backflow effect will only occur when the incense is burnt at least at the number 3 mark
When lit, the flame will cover part 1 and some of part 2, during this time, the smoke will rise as because the heated air is less dense than the surrounding air. The hot air is lighter than cold air which pushes the smoke upward. As part 1 and 2 of the cone incense is still solid, there is only one way up
When part 2 burns completely, the hollow (part 3) reveals THIS IS WHEN THE BACKFLOW start happening
The air pressure has been constantly pushing down, as there is a hollow part, which allows the smoke to pass through causing the smoke to flow backward
This "downflow" (backflow) smoke will rise if disturbed
You need to ensure the hole of the cone incense in line with the hole of the incense holder to see the full backflow smoke effect.
PLEASE NOTE: ONLY LIT INCENSE IN AN OPEN SPACE WHICH EXCELLENT VENTILATION. DO NOT LEAVE YOUR INCENSE UNATTENDED AS IT IS A FIRE HAZARD.
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