Made a costly and dumb mistake

I produce pottery and lost $450 in comissions and around 20 hours of careful work to make the pieces all special because i didnt teste a new glaze batch even having a bad feeling. It worked the last two times without testing because it was mixed at the clay facility. This time it was brought home instead then mixed later.. Dont be dumb like me and follow your gut feeling if its got a risk attached!! Urgh!