I bought some dark choccolate (85 per cent cocoa) and it does contain a bit of sugar (as third ingredient). It contains 18g of total carbs (I count total carbs instead of net carbs) per bar (100g). Would eating like 10g of this choccolate a day Kick me out of ketosis?
Sorry for my bad English 
You might eventually get to the point of enjoying unsweetened chocolate. It used to taste very bitter, almost inedible, to me, but eventually my taste changed, and I enjoy it quite a bit.
It will kick you out of ketosis
why
because you are kidding yourself when you say you will only eat 10 g a day.
you will end up eating the entire bar.
no, but if you don’t want to waste a carb on one tiny piece of chocolate, try making your own without ANY sugar! I make delicious chocolate bars and eat about 1/4 of the whole bar each day … the entire bar is like 1 net carb but I wouldn’t eat the entire thing personally, because I watch total carbs (not net), and try to fill myself up with meats and cheese primarily. It’s a great recipe, using 1 oz baker’s chocolate, 4 tablespoons of butter, tsp of vanilla, pinch of salt, and powdered erythritol to taste (and personally I keep the sweetener low, because if it’s too sweet I WILL want to eat the whole bar. So just enough to be a yummy little treat). Pour into molds and freeze. Viola!
