On Fri, Dec 6, 2013 at 3:28 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On Thu, Dec 5, 2013 at 7:39 PM, Bob Armstrong <bob
at jfcl.com> wrote:
Does anybody have a source or replacement for
LA120 DECwriter III ribbons?
I don't have any that are any newer, but what about adding a solvent to
moisten the ones you have? A quick patent search reveals methods of
impregnating fibers with ink and acetone to make typewriter ribbons, but
there must be more than that because acetone is so volatile. A mix of
acetone and a heavier aromatic solvent?
Digging deeper into patent 2104237, and this makes sense, acetone is
used in the ribbon process not as an ink solvent, but to fuse the cut
ends of cellulose acetate ribbons so they don't fray.
So acetone would be bad on dead ribbons.
has this to say...
"The vehicle [solvent] is more critical to good results and includes
a variety of combinations of non-drying constituents such as oleic
acid, castor and whale oils, vaseline, soap, and glycerine. Tricresyl
phosphate and high molecular alcohols are sometimes used as
"The base of typewriter ink is usually castor oil, because it is slow drying"
Castor oil seems safe enough to work with.