An alternative or variant name for collodion, the viscous cellulose nitrate solution used in early photography.
Collodion + '-um' (a Latin suffix sometimes added to English chemical terms). A less common variant name for the same substance.
Chemistry has many variant names for the same compound—'collodium' vs 'collodion' vs 'cellulose nitrate'—because different scientists and countries coined terms independently before international standards were established.
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