Concept:
Categorizing basic ceramic terms into their proper process groups (flaws, atmospheres, techniques).
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Step 1:
Crystalline refers to a highly sought-after glaze effect where large macro-crystals grow in the glass matrix during a controlled cooling cycle. (A-IV)
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Step 2:
Reduction refers to a specific type of kiln atmosphere during firing, where oxygen is choked off to force carbon to pull oxygen atoms out of the metallic oxides in the clay and glaze. (B-III)
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Step 3:
Pinholing is a common glaze making fault (flaw) where tiny bubbles pop in the glaze but fail to smooth over before the kiln cools, leaving tiny holes. (C-I)
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Step 4:
An engobe is a liquid clay mixture applied to a pot to change its surface color or texture, which is practically synonymous with a slip. (D-II)
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Step 5:
Combining these matches results in the sequence A-IV, B-III, C-I, D-II.
\[
\boxed{\text{(4) A-IV, B-III, C-I, D-II}}
\]
