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I've been reading Clay and Glazes for the Potter by Daniel Rhodes as well as Mastering Cone 6 Glazes by Hesselberth. Reading these and watching my own firings got me to thinking... How long do thermocouples last? Mine has been fired 125 times. I think it's (I don't have my kiln log in front of me for exact numbers) 55 cone 04 slow bisque, 55 cone 6 slow glaze, 15 cone 05 fast glaze (transfers). And How do you know when your thermocouple is starting to have issues? In my last couple of firings I have had a couple of pieces develop pinholes. I'm trying to remedy this issue since I have never had it before these 2 firings. I am using the same glazes as I have been. I know it might be my bisque firing as well. To fix pinholes at what temperature should I add a hold to burn out the issue? Just a hold at the end temperature? It could also be that my thermocouple is drifting because it needs to be replaced. The cone 6 before this load did not look over fired but this cone looks a little towards the over fired range. It could just be where it was placed or something. If I run a test load through at cone 5 should I add a hold at the end temp? If so for how long? In this last load I also had a couple Amaco Blue Rutile pieces in there and they seem more brown than blue than they usually are. This can also happen if I have the glaze too thin so am not sure if Blue rutile runs brown if over fired. Thank you for helping me answer these questions.