Newsletter Block This newsletter signup form needs a storage option. Edit the block and enter a storage location via the Storage tab. The cobalt blue that everyone told me didn't exist. I spent years testing glazes, powders, and underglazes trying to find a true matte blue. None of it worked, until I stopped trying to force it and built my own method instead.Watch how I did it, and how the same method works for any colour, not just my cobalt blue. Email Address Teach Me The Recipe No spam, just the video. Unsubscribe anytime.