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Marcia Selsor

Obvara Firing Technique

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The lichen patterns seem to grow on smooth surfaces.

More dramatic color contrasts seem to occur on textured surfaces.

Marcia

Marcia, I have the lichen pattern grow on not smooth surfaces also.  I currently thinking it has to due the breakdown of the the obvara mixture, after the gas in the mix has burned/escaped.  The lichen patterns seem to show up at the end of the firings.  Its on my notes for the next firing in the spring.

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I'll have to watch that. We got some beautiful lichen on rough and burnished pieces at the Alternative Firing conference. But I'll have to go back and look at the photos to see if we had more lichen on the second day.

I used a week old mix for a second round of firing in my own studio. I'll have to look closer there too.

Thanks for the notes. I'll see if I can let you know more explicitly about our firings.

Marcia

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Here are some of the results from the PC Alterntive Firing Conference in Edina, MN.

The first 2 were fired on the first day.The next 2 were fired on the second day using the same batch.of mix. Pretty much the same from Jane Jermyn, See above post by Up in Smoke. So these may not go with your lichen observation.Some were burnished but some were not burnished.

post-1954-0-39351100-1382661178_thumb.jpg

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post-1954-0-39351100-1382661178_thumb.jpg

post-1954-0-56906000-1382661230_thumb.jpg

post-1954-0-77959500-1382661319_thumb.jpg

post-1954-0-12249100-1382661360_thumb.jpg

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this is from a post in July. I thought I had posted the recipe.

here is the brew:

1 kilo or 2.2 pounds of flour

1 tbsp of sugar

1-2 packets of yeast

10 liters or 2.6 gallons of water

mix, cover and let it ferment for 3 days.

SInce this happens at 1650, colder then raku, and you need the porosity of the clay,reduction might obsure the cool patterns.

This is from Jane Jerlyn's FB page too.Possibly a loose conversion to standard measurements. Her Obvara work is stunning sculptural forms.

Marcia

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