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yes
Not shortening. Use about one tablespoon of vegitable oil per pound of chocolate.
You could substitute shortening for oil in a cake mix, but it is not recommended. The resulting cake made with shortening will have a noticeably different texture and mouthfeel. Yes you Can. Shortening.. or Hydrogenated Oil is basically poison anyways.
Yes
Yes, for one cup of shortening use one cup of butter.
shortening can be used for cookies because you don't have to put it in the freezer like butter. but you can use butter or vegetable oil to replace shortening but you will have to wait.
if you want to coat the cake ball, no bakers chocolate will not set hard, use candy coating. Wilton makes them. Also in the states they sell something called "bark" it is in the baking section, same as candy melts. Yes, I have used bakers chocolate for coating. I add about a tbl spoon of shortening to about 6 oz of chocolate while melting.
yes
You can, but your pretzels won't taste nearly as good. It's like using shortening in cake frosting, as most bakeries do. That's why their frosting is not very good. It's much better to use butter or margarine if you want to produce the tastiest result.
use butter flavored Crisco
Yes, you can melt shortening and use in a cake recipe. It will change the texture and possibly add heaviness to the cake, but it will still be good.
You can use white chocolate... I made a white chocolate and carmel cake several time. The recipes are easily found... My favorite is the Food Network!