Less than a year ago, probably last September I bought the Carder Method DVD's and meticulously set up my studio. I thinned all of my paint with medium and had them in mason jars as instructed by Mark. Long story short, the building where I had my studio set up, I ended up selling and have just as of yesterday set up a new studio. My question: Is the paint still good to use? (BTW, the mason jars have not been opened since they were mixed) Thanks for the help.