Yes HK, I’d say my treatment is visible in nearly all conditions. The only time I’d say that it can’t be seen if if I was stood directly beneath a spot light then the camera may not pick it up because of the light bounce but I still think it would be seen by the human eye.
In my Brandwood sessions I had #44 which I believe would be equivalent to a #36 at HIS.
I expressed my desire not to go too dark. My treatment with #28 was in hindsight too dark but that was my own choice/fault.
A too dark treatment can very easily look ‘fake’. I know a lot of people like the strong looking treatments that can be seen but actually I think some of the very best and most natural treatments are some of the lightest ones. That said, we are dictated to by the colour of our own remaining hair and mine is surprisingly dark.