Top post, that, Gee. Certainly I will be giving Ruth a look as it is she who normally likes to dabble in the dark arts of herb preserving.
She quite successfully used the dehydrator for a few herbs as it is quick and also keeps the colour better with some. Trouble is, as you know, dried leaves are very light so if you open the front to check on progress, as you would with fruits, etc, half the leaves waft out onto the floor.
I don't know about preserving the green colour by using the dehydrator but the air in the kitchen turned very blue at times too!