Markings on fired glass cheese plates

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    I have fired several glass cheese plates and have had no problems, but recently the last 4 have had what looks like smears or water marks on them. I have washed each piece of glass with hot water and soap, dried them throughly and then took rubbing alcohol and clean them one more. I have no idea what is going on. My firing schedule is:

    450 to 11:50 – hold 40 minutes

    Full to 1270 – hold 10 minutes

    Full to 960 – hold for 1 hours

    100 to 750 – hold for 10 minutes

    Stephen Richard

    My suggestion is to stop before the rubbing alcohol.  It has additives that won’t do you glass any good.  After the water and soap rinse thoroughly, then polish dry with un-printed paper towels or cloth towells that have had no fabric softer used with them at any time during washing and drying.  The streaks are the bits of residue left by alcohol and or cloth.



    Stephen Richard

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    I have never had any issues with the rubbing alcohol but did have a problem with brown paper towels especially if they are recycled. Someone told me ther is a dye or some kind of stabilizer (?) in them that will do this.  A lampworker/potter firend swears by newspaper.

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