| http://www.w3.org/ns/prov#value | - Many of the methine colorant compounds useful in our invention and having formula (I) are known compounds as shown by U.S. Pat. Nos. 2,583,614, 2,811,544, 2,850,520, 3,189,641, 3,247,211, 3,326,960, 3,386,491, 3,453,270, 3,553,245, 3,652,636, 3,787,476, 3,808,256, 3,829,461, 3,879,434, 3,920,719, 3,927,063, 4,312,985 and 4,316,013 and the patents and other references disclosed therein.
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