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You can find a digital scan of the Declaration of War on Japan in our online Catalog:
Joint Resolution December 8, 1941, Public Law 77-328, 55 STAT 795, which declared war on Japan., 12/8/1941
Here is a link to a higher-resolution copy in TIF format, which might be more suitable for printing (although still in black & white): https://nara-media-001.s3.amazonaws.com/arcmedia/media/images/28/22/28-2113M.TIF
This can be downloaded, opened and printed in most common image processing applications (such as Photoshop).