hat making

Hello everyone, I just made my first hat, and it has some really bad white spots and discoloration, I believe from the stiffener. I used dewaxed shellac flakes in alcohol. Does anyone have any suggestions on getting rid of it, or ideas what caused it?

I broke out my Peters Brothers hemp straw Indy hats today & it was a little wonky form storage so I went to the hardware store & I bought a 1/2 pint of clear shellac & som denatured alcohol as well as a small spray bottle. I mixed up 8 ounces of shellac to 4 ounces of alcohol & it seems to have...