155 mya "Squid" has preserved ink sac

["Richard W. Travsky" <rtravsky@uwyo.edu>]

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.
...