| Back in the old days, when hair dyeing was in its | | | | the natural colouring of your hair but doesn't lighten it |
| infancy, hair color products routinely gave off a rather | | | | due to the fact that it contains no ammonia or |
| noxious rotten egg type of odour. It is good news then | | | | peroxide. |
| that today, the modern equivalents of these bygone | | | | Demi-permanent hair dye colours usually last a lot |
| products smell a whole lot nicer. The great thing about | | | | longer than the semi-permanent variety, at around |
| these present versions is that they are so much | | | | 22-28 shampoos. The pre-coloured molecules enter |
| simpler to apply as well. Whether it be to wet hair or | | | | the hair through the cuticle, as in the semi-permanent |
| dry, quite a few of the colouring products available | | | | dye but once in the hairs cortex they fuse with other |
| today can be worked into the hair forming a shampoo | | | | molecules to give medium sized colour molecules. |
| like lather, left to work its magic (with or without a | | | | Because these molecules are larger in size, they now |
| plastic hair covering piece, depending on the product) | | | | take that much longer to wash out of the hair. |
| then rinsed out and conditioned. How simple is that? | | | | Demi-permanent hair dye does not contain any |
| Unfortunately, simplicity comes at a price, as is most | | | | ammonia so the natural pigmentation of the hair cannot |
| often the case in life. Chemicals present in the hair dye, | | | | be lightened, but it does contain a small amount of |
| such as ammonia and peroxide, can be just as harsh | | | | peroxide which allows for slight (but noticeable) colour |
| and damaging to your hair today as were the | | | | change. |
| chemicals in the early days of hair colouring, and this is | | | | Permanent hair dye is what is used for major hair |
| especially true if you dye your hair too often. Obviously | | | | colour changes, for example going from black to |
| your hair is going to react differently to different levels | | | | blonde or vice-versa. Permanent hair dye uses both |
| of the chemicals found in various types of products, | | | | peroxide and ammonia so when the molecules enter |
| but generally there are three main types of hair | | | | the hair they react and expand to a size that cannot |
| colouring levels used by the main hair product | | | | actually be washed out. The only way out with this |
| companies today- semi-permanent, demi-permanent | | | | method, apart from re-dyeing, is to let the hair grow |
| and permanent. | | | | out. This type of hair dye reacts by lightening your |
| Semi-permanent colour basically adds colour to the | | | | natural hair pigmentation, forming a new base and then |
| hair without changing the natural colouring too much. | | | | adding a new permanent colour which combines with |
| This kind of hair dye consists of tiny molecules that | | | | your own natural hair pigment. This is the reason the |
| enter the hair through the cuticle but do not affect the | | | | colour you have to chosen to dye your hair with may |
| hairs natural pigmentation. After several washes these | | | | look different on you than on someone else who has |
| molecules, because they are so small, eventually exit | | | | used the same colour. As hair grows at a rate of |
| the hair shaft leaving your hair as it was before the | | | | about half an inch a month, this kind of hair dye will |
| hair dyeing treatment. Semi-permanent hair dye usually | | | | present the problem of roots, so you will probably |
| lasts from six to twelve shampoos and has the ability | | | | need to touch up the dye every few weeks. |
| to cover up to fifty percent of your greys. It enhances | | | | |