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| Occasionally customers will look at an
underglaze marker and think they've received the wrong color. This
happens because the pre-fired color of the marker looks different
than a post-fired color (which is represented on the packaging).
Generally speaking, two chemical lend themselves
to this type of product: Cobalt and Red Iron Oxide. They are
used in combination to get the marker colors.
Post-fired, the chemicals combine as follows:
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Blue = Cobalt
Slate = Cobalt + Red Iron Oxide
Terra Cotta = Red Iron Oxide |
However, pre-fired, the color of the Slate
marker is deceiving. The Red Iron
Oxide dominates and the marker looks like it might be a Terra Cotta
marker. This is because before firing, the Cobalt is not very vivid
and only slightly darkens the Terra Cotta color of the Red Iron Oxide.
So, if you ordered slate marker and the
label says "slate", but it looks Terra Cotta,
everything is fine. It's just the pre-fired color. |
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| Occasionally customers will look at an underglaze
chalk-crayon and think they have gotten the wrong color. This
happens because the pre-fired color of the chalk-crayon looks different
than in a post-fired color. A couple of the colors look very similar
pre-fired, and also look unlike the post-fired color Here's
the most common example.
Dark Blue vs. Lilac
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Lilac:
Pre-fired - Slightly darker and more purple looking
Dark Blue: Pre-fired - Slightly more
pink or pastel looking
Note: It is often the easiest to
tell the difference by looking at the end of the chalk, not the
sides. |
So, if you ordered a Dark Blue
chalk-crayon and it came wrapped in paper that says "Dark
Blue", but it looks like Lilac (or pink), everything is fine.
It's just the pre-fired color. |
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