When an Incense stick has lightened the vapours from it are large enough that they are visible to the naked eye. Does that mean that it forms a heterogeneous mixture with air?

A heterogeneous mixture consists of visibly different substances or phases. Mixtures are constituted by more than one kind of pure form of matter, known as a substance. Colloids are heterogeneous mixtures in which the particle size is too small to be seen with the naked eye, but is big enough to scatter light. The particles are called the dispersed phase and the medium in which they are distributed is called the dispersion medium.

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