Array ( [status] => 200 [status_message] => Picture item [data] => Array ( [picture_id] => 1209 [moddate] => 2019-01-01 20:18:26 [title] => Plainsman M390 plus 12.5% Christie STKO 22S grog [alttag] => [titletag] => [metadescrip] => [metakeys] => [S3URL] => https://reference.s3.us-west-2.amazonaws.com/images/pictures/jodlylosok.jpg [S3Date] => 2018-04-13 17:03:04 [url] => [picture_date] => 0000-00-00 00:00:00 [path] => images/pictures/ [filename] => jodlylosok.jpg [deleted] => 0 [notfound] => 0 [descrip] => This is the surface after trimming. M390 is normally smooth. It is plastic enough to be able to tolerate this grog without apparent loss in workability (still throwing well). And it does not feel overly abrasive on the wheel (unless your hand goes down onto the wheelhead). How is that possible? Although the particles of grog are large, they are not touching each other and readily press down into the clay. [disqualify] => 1 [timelinephoto] => 0 [timeline_name] => [plainsman] => [insight_help_id] => 0 [fullpath] => /var/www/digitalfire.com/4sight/images/pictures/jodlylosok.jpg [fullurl] => https://digitalfire.com/4sight/images/pictures/jodlylosok.jpg [pictures] => Array ( [1169] => Array ( [z] => fuhrobarug [alttag] => [titletag] => [title] => M390 Horse [notes] => M390 horse under construction by Katie Stone at Medalta in 2014. [filename] => bujhaxihuk.jpg [path] => images/pictures/ [fullpath] => /var/www/digitalfire.com/4sight/images/pictures/ [fullurl] => https://digitalfire.com/4sight/images/pictures/ [picture_date] => 0000-00-00 00:00:00 [S3URL] => https://reference.s3.us-west-2.amazonaws.com/images/pictures/bujhaxihuk.jpg [S3Date] => 2018-04-13 17:27:05 [timelinephoto] => 0 [ord] => 0 [direction] => out [url] => ) [1220] => Array ( [z] => fatrovyvoz [alttag] => [titletag] => [title] => Wedge kyanite in M390 for better drying, firing [notes] => Plainsman M390 with 12.5% 48 mesh kyanite wedged in. This was added to improve the drying properties while maintaining the plasticity. However, the throwing also improved! It was easier to pull up into a tall cylinder. The surface texture is only moderately disrupted by a slight graininess. [filename] => kixtykipan.jpg [path] => images/pictures/ [fullpath] => /var/www/digitalfire.com/4sight/images/pictures/ [fullurl] => https://digitalfire.com/4sight/images/pictures/ [picture_date] => 0000-00-00 00:00:00 [S3URL] => https://reference.s3.us-west-2.amazonaws.com/images/pictures/kixtykipan.jpg [S3Date] => 2018-04-13 16:10:04 [timelinephoto] => 0 [ord] => 0 [direction] => out [url] => ) [1225] => Array ( [z] => tikdezukow [alttag] => [titletag] => [title] => M390 Cone 6 red with added kyanite, grog [notes] => Samples fired to cone 6. Lower left: Plainsman M390. Upper left: M390 plus 12.5% 48 mesh kyanite (no visible effect on fired color or character). Upper right: M390 plus 12.5% Christie STKO 22S 40 mesh grog (strangely it fires a darker color and appears more vitreous and there is no soluble salts circle). Both grogs were wedged into the clay and did not stiffen it or affect plasticity much (in fact, both were easier to pull up during throwing). The percentage water content went from the 21% to 19% in both. [filename] => rindapitix.jpg [path] => images/pictures/ [fullpath] => /var/www/digitalfire.com/4sight/images/pictures/ [fullurl] => https://digitalfire.com/4sight/images/pictures/ [picture_date] => 0000-00-00 00:00:00 [S3URL] => https://reference.s3.us-west-2.amazonaws.com/images/pictures/rindapitix.jpg [S3Date] => 2018-04-13 16:57:05 [timelinephoto] => 1 [ord] => 0 [direction] => out [url] => ) ) [links] => Array ( [material] => Array ( [0] => Array ( [link] => material/Christy+Minerals+STKO+22+S+Grog [label] => Christy Minerals STKO 22 S Grog [keywords] => [ord] => 2 ) ) [glossary] => Array ( [0] => Array ( [link] => glossary/Grog [descrip] => Grog is a term used in ceramics to describe crushed brick (or other fired ceramic) aggregate that is added to sculpture and structural clays to improve drying properties. [label] => Grog [ord] => 99 ) ) ) ) ) Plainsman M390 plus 12.5% Christie STKO 22S grog
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Plainsman M390 plus 12.5% Christie STKO 22S grog

This is the surface after trimming. M390 is normally smooth. It is plastic enough to be able to tolerate this grog without apparent loss in workability (still throwing well). And it does not feel overly abrasive on the wheel (unless your hand goes down onto the wheelhead). How is that possible? Although the particles of grog are large, they are not touching each other and readily press down into the clay.

Plainsman M390 plus 12.5% Christie STKO 22S grog

Related Pictures

M390 Horse

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M390 horse under construction by Katie Stone at Medalta in 2014.

Wedge kyanite in M390 for better drying, firing

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Plainsman M390 with 12.5% 48 mesh kyanite wedged in. This was added to improve the drying properties while maintaining the plasticity. However, the throwing also improved! It was easier to pull up into a tall cylinder. The surface texture is only moderately disrupted by a slight graininess.

M390 Cone 6 red with added kyanite, grog

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Samples fired to cone 6. Lower left: Plainsman M390. Upper left: M390 plus 12.5% 48 mesh kyanite (no visible effect on fired color or character). Upper right: M390 plus 12.5% Christie STKO 22S 40 mesh grog (strangely it fires a darker color and appears more vitreous and there is no soluble salts circle). Both grogs were wedged into the clay and did not stiffen it or affect plasticity much (in fact, both were easier to pull up during throwing). The percentage water content went from the 21% to 19% in both.

Links

Materials Christy Minerals STKO 22 S Grog
Glossary Grog
Grog is a term used in ceramics to describe crushed brick (or other fired ceramic) aggregate that is added to sculpture and structural clays to improve drying properties.

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