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155 mya "Squid" has preserved ink sac




http://www.dailymail.co.uk/sciencetech/article-1207367/The-150million-year-old-squid-fossil-perfectly-preserved-scientists-make-ink-ink-sac.html

or     http://preview.tinyurl.com/onfe3k

The squid-like creature perished some 155million years ago.

But despite the vast passage of time, experts who unearthed the fossilised remains were able to extract ink from its perfectly-preserved sac and use it to paint a picture of the ancient animal.
...
The inch-long ink sac had become separated from its owner - Belemnotheutis antiquus - which Dr Wilby said was squid-like but not the same as a modern-day squid.

However the black ink was of exactly the same structure as that of todays version. Although solidified, some was ground up with an ammonia solution to make paint.
...