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I've just opened my first firing with Hesselberth/Roy's suggested firing schedule for cone 6.  I was surprised to see that my glazes turned out way more matt than usual (see photo of two pots, same glaze) as well as having a complete color change with my layered blue.  Has anyone else experienced a complete change (for the worse) when using this firing schedule.  I've rechecked the programing and it was entered correctly.  Maybe having 3" brick on my kiln changes the game???  Would love some input.  I'm refiring this load and hoping to salvage it.

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+1 for some of the matte glazes like Pres and Chris said, they look really nice!

 

For slow cooling, if you have a glaze with a high level of MgO, CaO, SrO, BaO, Al2O3, and somewhat with TiO2 or ZnO and slow cool it then it gives time for microcrystals to develop and cause the matteness (if that's a word). Fast cooling same glazes usually results in a gloss unless it is not a true matte glaze and just an underfired one.

 

The picture below is from Mastering Cone 6 Glazes, same glaze on each test tile, just different thickness and cooling schedule.

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the pics are from this link: http://www.masteringglazes.com/mastering-cone-6-glazes/frequently-asked-questions.html

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Always test with cones if you're not programming a specific cone for the peak temperature. With the Dynatrol controller on your L&L you can put in a cone value for the peak temperature instead of degrees, which may solve the problem. When you get to that step of the program, instead of putting in a temp, hit 'Other' and it will prompt you to put in a cone value instead of a temperature.

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