I have made Chocolate Roses before. I am certain I used chocolate.. But then I decided to use candy melts since in most cases the rose is not likely to be eaten (and it costs less for practicing). I do need to keep a log (lesson 1) as I just grabbed a recipe from the Internet and just wasted a lot of candy melts. I ended up buying some Mercken’s white chips but have not used it yet to compliment my large supply of red, white, light cocoa, and dark choc Wilton’s candy melts. I want to use real choc. and white chocolate as I perfect this skill of roses.
Edited to add: I turned to the Cake Bible recipe and had no issues using the candy melts (Lesson 2: Look in RLB book first)
Meanwhile, here is a photo array of what I have done. It is funny to see my first attempt (certainly posted here somewhere), an attempt some months ago (appears to be best) and the most recent (red).