Cetol does come in a couple of different shades. There is a traditional, orangey look and another lighter color. While the product itself does not stain the wood, it had a large number of suspended coloring inside its protective layer, supposedly designed to keep the sun's rays off the wood.
I've been using Cetol for almost 20 yrs now. I still love it.
4 coats on the bits of teak trim (we have very little of it on the exterior) and it looks bristol even after a whole summer of chartering and being outside all winter. I expect to get at least 3 years from this application.
Also, if we are talking exterior teak, there can't be any hidden damage. Other woods, maybe, but teak? That's why they use real teak. It isn't damaged by water
. You can pick up a 200 year old teak log from under water in a swamp in Thailand
and cut into it... guess what?? Still perfect wood. The natural oils make it impervious to moisture.
The look certainly isn't for everyone. I don't like the look either. But... I do like the once every 3-4 year maintenance
cycle if used on little bits of teak trim. (Don't think it would look so great on teak decks or a beautifull designed all teak area though)