@Hersute: thx for the hint, I will order an Aufero Color Conditioner as soon as possible. You told me about a sun protector for the hair system, you have one to suggest me, or what I have to take care if I will buy one? In this case you don’t think that will be a good idea to try to go for a darker tone on ordering a new Stock unit, for example the color #3?
@Paul: I attach my unit with glue (Magnetc Jeck an Italian product, similar to Ultra Hold, for the front and Ghost Bond for the rest), and I remove it only every 4-6 weeks. I have to shampooing my original hair every approx 3 Days, and it’s not so easy to shampooing only my original hair and not the unit… I sometime use a hair wax to style the hair, but not frequently. I use also a System Specific Shampoo from a German hair replacement online shop; I also use a leave-in conditioner from the same shop. As you suggest I will try to use it every day now. You have some brand suggestion for the conditioner?

Thx and Regards
Alessandro