Hello again jvgardengirl.
Good questions.
Sedu became a nickname for the ever-popular silky straight look of hair that can be achieved, as we all know, via flatirons. It's another name given to straightened hair but really is part of the "name" of a particular brand. (I think made by Folica)
Now another line of hair straighteners has emerged with the name is "Solia". I've also seen a "Nano". There are ceramic straighteners which proclaim to produce even heat when applying to the hair sections. Solia is another brand name and I believe it was this brand that actually came up with a better flatiron, making the curved plated should you decide to put in a little "bend" on the ends. They also seem to be the first to come up with a Narrow flatiron head so bangs and short hair could easily be straightened. At least they were the first ones, I noticed that had this design.
Like all technology, something better is bound to come along. And so Tourmaline has been discovered. This is actually from a stone or gem that helps the iron to heat
more quickly, while producing more negative ions that ultimately means a faster way to produce straight hair.
And yes, someone with really unruly hair can get straight hair much more easily and even faster. So your homework has paid off. And we're all learning together. Further investigation helped me to understand why the tourmalines worked better and therefore, I am passing the information onto you.
There IS hope for the very curly, tight, gnarly headed.
