So 1/4 teaspoon of it dissolved in 10ml pg... What is that equal too worth of my cotton candy flavoring?
Cotton Candy and EM are the same thing by two different names. Once you dissolve 1/4 teaspoon in 10ml of PG it will be like you bought the already dissolved EM/Cotton Candy concentrated flavoring. I've never tried making a juice with just EM/Cotton Candy but according the recommended usage for a single flavor of Cotton Candy it's 10-20% of the concentrated flavoring. That would be 10-20% of the flavoring you make by dissolving the 1/4 teaspoon of EM crystals in 10ml of PG.
Example: If you are making a 10ml test batch, you would use 1-2ml of the flavoring your making (the 1/4 teaspoon of crystals dissolved in the 10ml of PG will be the concentrated flavor - use 1-2 ml of that to 8-9ml of base - I would start with 1ml of flavoring and 9ml of base).
Cheers,
Steve