Ah yes, if you have dark brown or black hair, you can achieve a blonde or platinum blonde color with hair treatments quite easily.  Many women make this transition for a more glamorous or feminine look, but be aware that it is an extreme and drastic change from your natural hair color.  In order to achieve a natural looking blonde color, your underlying hair color needs to be quite light brown or blonde in color, as a dark base color will produce unnatural and artificial looking results.  The most natural looking results for a blonde color are achieved by carefully moving from one level of treatment to the next, with intermediate steps along the way.  It is also important to remember that blonde hair inevitably fades somewhat with age, so if you prefer to maintain a very pure and intense blonde color, you will need to regularly re-treat your color.  Overall blonde hair color can look absolutely lovely, but careful consideration and professional help is highly recommended to achieve the best results.
assistant
Now we are getting into the really fashionable and highly desired hair colors!  Blonde hair color has become quite popular among women in recent years, though it is most commonly achieved by either using a highly artificial chemical treatment to strip all natural pigment and color from your hair, or else by a gradual transition towards a lighter brunette or even a light blonde color.   These hair color treatments are quite expensive and time consuming, involving multiple steps of hair bleaching and chemical coloring.  The result will almost always look very artificial and unnatural, and you will need to rely on constant maintenance to keep the color looking good, including the use of additional color products.  On the plus side, once you have achieved the blonde look, it will last for quite some time before becoming unsightly and faded, and you will probably have the option to periodically refresh the color treatment.  Overall, I think blonde hair color is definitely quite glamorous and visually appealing, but also quite expensive and time consuming to maintain.  Achieving a natural looking blonde hair color requires advanced skill and professional help, so it is definitely best to consult with a professional stylist or hair salon for the best results.
assistant
Why are there not as many redheads?
user
Interesting question!  Redheads are fairly rare in the general population and in most populations of the world.  In Europe and other regions of the world this is due to a genetic trait called the “red hair allele”, which is quite recessive and tends to be lost over time through natural selection.  The red hair allele is thought to have arisen in humans around 10,000 years ago.  In populations where the allele is common, such as in Ireland and Scotland, redheads may be up to 10% of the population, but in most populations the frequency is only 1-2%.  Scientists are not sure why the red hair allele is so rare at this time, but one theory is that since red hair is an easily recognizable and distinctive trait, it makes the bearer more vulnerable to differential natural selection pressures, such as in a niche environment of reduced sunlight.  Currently redheads are more likely to be autistic or schizophrenic, although these results are controversial and it is unclear if there is a causal connection between the two traits.
assistant
Will a brunette look good as a red head?
user
Ah yes, this is certainly a fashion concern for many!  It is certainly possible for a brunette to become a redhead, but there are a number of practical considerations for this procedure.  First, in order to achieve a natural looking red hair color, your hair must be quite light brown or even blonde in color.  As a red head you will need to maintain your hair color carefully, as the red hair trait is quite recessive and will fade and gradually return to its original color within just a few years without proper maintenance.  Finally, there are a wide variety of methods available to achieve red hair color, ranging from slightly cosmetic and inexpensive dye treatments, to more expensive chemical treatments, to intense laser hair treatments.  The most natural looking results are achieved by gradually moving from one level of treatment to the next, but be aware that with any treatment the final results can sometimes look unnatural and off-putting.  Overall I think a brunette will generally look good as a red head, but the ideal hair color is quite tricky to achieve, and a thorough consultation with a professional stylist or hair salon is highly recommended for the best results.
assistant
What about transitioning to a copper/red/brown?
user
Sure, this is another quite common hair color choice among women.  If you have a baseline hair color that is very dark, such as black or very dark brown, you can achieve a rich copper or red/brown color fairly quickly using color treatments.  The best method for this is to move gradually from a dark base color towards the copper/red/brown color, with intermediate steps.  Otherwise the results can look quite artificial and unnatural.   Regarding maintenance, copper/red/brown hair color is generally much easier to maintain than true red hair color, as it doesn’t involve as drastic a change in the natural pigments in your hair.  You will still need to maintain the color carefully, especially if you want the results to look natural and not too severe, and you should get a professional evaluation of the results periodically to make sure your color is still looking good.
assistant
Okay, what about going to blonde?
user