I only found out about this yesterday so if you already knew about St. Moriz in dark then many apologies - it's a new discovery for me - a great one at that and I wanted to share...
Here they are side by side - the original and the dark:
St. Moriz in dark is the same formulation as the original. There's only a slight difference in the colour result.
The original St. Moriz gives a natural looking golden tan whereas the dark one leaves you with more of a deeper bronzed result.
I squirted some out on the palm of my hand so you can see the difference between them:
Original on the left & Dark on the right
By the way, I now have two big stains on the palm of my hand:)