The chronology of Rembrandt's print production has been linked to his usage of batches of paper, each identified by the presence of a specific watermark or its twin. Using a decision tree strategy and a chainspace match comparison, the Watermark Identification in Rembrandt's Etchings (WIRE) Project at Cornell has developed a computer-based interrogatory allowing identification of the watermark from a Rembrandt print among more than 500 possibilities in a matter of minutes. Observations having art-historical impact can be gleaned from watermark identification in Rembrandt's etchings.