Spectrum Raku Glazes

(850 - 891): Spectrum Raku Glazes were developed for firing in either electric or gas kilns. Click here or scroll down to see the firing process for these glazes.
  • Seven of the Raku glazes are lead-free and non-toxic (850, 851, 854, 856, 882, 883 and 884).
  • All of the rest are lead-free, but are over the threshold limit for copper and are therefore not non-toxic in the liquid state.
Spectrum Raku Glazes are set up for brushing application. They can also be poured or dipped on pieces, although they should probably be thinned with a little water for this type of application.

Due to the many variables involved in Raku firing, particularly during the reduction phase, our chip charts and printed color charts should be used only as approximate guidelines. Your results may vary greatly.

  Spectrum 850 Raku Clear Glaze
850
Raku Clear
Spectrum 851 Raku White Glaze
851
Raku White
Spectrum 852 Turquoise Glaze
852
Turquoise
Spectrum 853 Cobalt Blue Glaze
853
Cobalt Blue
Spectrum 855 Emerald Glaze
855
Emerald
Spectrum 856 Muddy Waters Glaze
856
Muddy Waters
Spectrum 871 Raku Yellow Glaze
871
Raku Yellow
Spectrum 873 Raku Red Glaze
873
Raku Red
Spectrum 860 Flash Glaze
860
Flash
Spectrum 861 Metallic Flash Glaze
861
Metallic Flash
Spectrum 862 Galaxy Glaze
862
Galaxy
Spectrum 863 Nebula Glaze
863
Nebula
Spectrum 864 Sunspot Glaze
864
Sunspot
Spectrum 865 Mars Glaze
865
Mars
Spectrum 866 Deep Space Glaze
866
Deep Space
Spectrum 880 Armadillo Glaze
880
Armadillo
Spectrum 872 Raku Orange Glaze
872
Raku Orange
Spectrum 870 Star Night Glaze
870
Star Night
Spectrum 875 Algae Bloom Glaze
875
Algae Bloom
Spectrum 878 Cosmic Copper Glaze
878
Cosmic Copper
Spectrum 881 Oxblood Glaze
881
Oxblood
 
Spectrum 882 Orchid Pink Glaze
882
Orchid Pink
Spectrum 883 Amethyst Glaze
883
Amethyst
Spectrum 884 Aqua Glaze
884
Aqua
Spectrum 885 Blue Topaz Glaze
885
Blue Topaz
Spectrum 887 Neptune Glaze
887
Neptune
Spectrum 891 Northern Lights Glaze
891
Northern Lights

Raku Firing:
Spectrum Raku Glazes can be fired anywhere from 1600 °F up to cone 06 (1850 °F) in either an electric or gas kiln. Spectrum recommends firing 850 to 859 to a peak of 1700 - 1750 °F and 860 to 866 to a peak of 1600 - 1650 °F. The glazes pieces should be allowed to cool in the kiln to 1600 °F. Different combinations of peak temp and reduction starting temp will produce different results. While still red hot they should be transferred as quickly as possible into a reduction bin (typically a lidded metal garbage can or small metal container that has been lined with organic material, such as newspaper and/or sawdust, etc.). As soon as the pieces are in the bin the lid should be put on to keep oxygen from entering the container, in order to develop the reduction atmosphere. The pieces should be allowed to cool in the bin for at least 20 minutes. When the red hot pieces go into the bin the organic material ignites producing flames and smoke so this part of the firing, particularly the opening of the reduction bin, should be done outside.

Firing Tips:
  • Try to size the reduction bin to the size of the piece.
  • Establish a good seal to the reduction bin so that air is not entering and smoke is not leaving the bin.
  • Position the organic material ( newspaper, sawdust, etc.) and the piece so that the flames can get all around the piece
  • Different organic materials may produce very different results, for example a glaze reduced in newspaper could be a beautiful blue color and the same glaze reduced in sawdust could have a metallic copper appearance.
  • Pieces should be cleaned immediately with water and a hard bristle brush.
  • After cleaning, warm the pieces in the kiln to evaporate any water from the piece. This helps to set the colors more permanently.

Products In This Category

Displaying products 1 - 27 of 27 results
$12.00
Glaze in the Spectrum Raku Glaze Series.
$12.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$15.00
Glaze in the Spectrum Raku Glaze Series.
$16.00
Glaze in the Spectrum Raku Glaze Series.
$14.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$22.00
Glaze in the Spectrum Raku Glaze Series.
$22.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
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$25.00
Glaze in the Spectrum Raku Glaze Series.
$15.00
Glaze in the Spectrum Raku Glaze Series. Lead Free.
$15.00
Glaze in the Spectrum Raku Glaze Series.
$33.00
Glaze in the Spectrum Raku Glaze Series. Lead Free.
$22.00
Glaze in the Spectrum Raku Glaze Series.
$25.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$25.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$17.00
Glaze in the Spectrum Raku Glaze Series.
$15.00
Glaze in the Spectrum Raku Glaze Series.
$15.00
Glaze in the Spectrum Raku Glaze Series.
$21.00
Glaze in the Spectrum Raku Glaze Series.
$21.00
Glaze in the Spectrum Raku Glaze Series.