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Lavender is not "made." It is a single recessive gene that, when a bird carries two copies, dilutes both red and black pigment (the only 2 pigments chicken feathers have).
There are some colours that are the result of two or more genes; buff and red are good examples of this. Other colours: blue, black, splash, white are caused by a single gene.
Many of the patterns on feathers are the result of a combination of genes, but a few such as sex-linked barring are the result of a single gene.
At the moment lavender is a popular colour, and is being introduced into breeds where it ws not previously found. Note that in the US the self-blue variety IS the lavender variety--they are synonyms, And self blue has been a recognised colour for a very long time.