On
hair dyes.... all dyes are really effective blockers to cell division and kills the dividing cells. Dye effectively binds with DNA and
histones. Remember our fundamental
biochemistry? Histones are proteins that clamps the DNA into heterochromatic
structures
and forms into domains. These are packets of homologous genes that codes for certain sets of structures in the body. Meaning bands of genes that forms into specific skeleton in the cell and finally into the organism as a whole. The octameric histone molecules must be uncoupled to give way for DNA replication prior to cell division. In other words the key to DNA synthesis lies in the stability of coupling and uncoupling of these histones in all levels of DNA structures. Bye dyes in general form a permanent ligand with histones thereby locking the histones and therefore unable to uncouple at the onset of DNA replication. Such reactions can effectively halt cell division, lock the genes therefore could
kill the cell. This is the profound effects of dyes. That is why it is not good to use dyes in foods.
Hair dyes are for hairs of course which are already keratinized. If hair dyes are confined in the non-living (meaning
keratin part) and not at the follicles, then it is alright to apply the dye for aesthetic purposes. But if it will penetrate at the follicular sites, then the story that I unfold above will take its course and cause abnormality into the follicles and may be the cause of cancer.
More abstracts about the Hair Dyes