Future studies could apply a wider range of techniques (e.g. similar to [34, 52]), such as XRF, Raman spectroscopy, high spectral resolution reflectance spectroscopy in the visible and NIR which could confirm the pigments and inks identified, and the materials used in the preparatory sketch.
Indeed, E Ink has identified 700 types of products that could use its technology, including power tools (which could show the amount of power remaining) and car key readers (which could report such details as the amount of gas left in a car and the vehicle's location in a parking lot).
Inside the ice chest, on a bed of ice, there's nothing but human fingers and bottles of Coke, all those fingers stained with the indelible ink which identifies a voting citizen — presumably someone who had voted for the Sénateur's opponent.
On the other hand, the majority of SLNs are small and the nodes from a single basin can often be grouped into one cassette (using ink to identify 'hot' and 'blue' nodes) saving laboratory time and effort.
Femoral and tibial condyles were carefully dissected separately without damaging the cartilage surface, and were then stained with India ink to identify the location, size and severity of cartilage degeneration.
On the other hand, the majority of sentinel nodes are small and the nodes from a single basin can often be grouped into one cassette (using ink to identify "hot" and "blue" nodes), saving laboratory time and effort.
Examination of the 3D cross-sectional images showed that the iron ink could be reliably identified, but the carbon ink could not be detected.
Such an approach might use multispectral imaging and pXRF to identify and clarify text on the surface layers and allow the constituents of inks to be identified.
Different inks, iron copper, iron zinc or iron copper zinc inks have been already identified in French 15th century manuscripts [9].
A significant number of ink tablets have been identified at Carlisle (also on Hadrian's Wall) The fact that letters were sent to and from places on Hadrian's Wall and further afield (Catterick, York, and London) raises the question of why more letters have been found at Vindolanda than other sites, but it is not possible to give a definitive answer.
