Search results
Results from the WOW.Com Content Network
Cephalopod ink is a dark-coloured or luminous ink released into water by most species of cephalopod, usually as an escape mechanism. All cephalopods, with the exception of the Nautilidae and the Cirrina (deep-sea octopuses), [ 1 ] are able to release ink to confuse predators .
An ink sac is an anatomical feature that is found in many cephalopod mollusks used to produce the defensive cephalopod ink. With the exception of nocturnal and very deep water cephalopods , all Coleoidea (squid, octopus and cuttlefish) which dwell in light conditions have an ink sac, which can be used to expel a cloud of dark ink in order to ...
With the exception of the Nautilidae and the species of octopus belonging to the suborder Cirrina, [51] all known cephalopods have an ink sac, which can be used to expel a cloud of dark ink to confuse predators. [25] This sac is a muscular bag which originated as an extension of the hindgut.
Cuttlefish ink was formerly an important dye, called sepia. To extract the sepia pigment from a cuttlefish (or squid), the ink sac is removed and dried then dissolved in a dilute alkali. The resulting solution is filtered to isolate the pigment, which is then precipitated with dilute hydrochloric acid. The isolated precipitate is the sepia pigment.
The cephalopod ink sac is a modified hypobranchial ... Some of these uses were found by analyzing traditional medicine and therapeutic techniques from a variety of ...
Pencils are commonly used at polling stations instead of pens. This is because ink might run on to different sections of the ballot and obscure the voter’s choice. The Facts
Cephalopod ink, known as sepia, turns from dark blue-black to brown on drying, and was used as an ink in the Graeco-Roman period and subsequently. Black atramentum was also used in ancient Rome ; in an article for The Christian Science Monitor , Sharon J. Huntington describes these other historical inks:
For premium support please call: 800-290-4726 more ways to reach us