A typewriter is disclosed which is capable of storing text in a memory and playing out the stored text on command. When the print point is moved back into the printed text for any reason, the typewriter will automatically return the print point to the same position it occupied prior to being moved back into the text, prior to the resumption of printing.

An improved process for etching of polymeric materials, in particular polyimide, by reaction with either an acid or alkaline etching solution is described. A reactive material, such as aluminum metal, is added to the etching solution in order to generate nascent hydrogen. The generation of this gas promotes the etching process by increasing the etching rate and dispersion of the etch residue.

Very sensitive electron beam positive resists have been obtained using films of nitrocellulose containing 10.5 to 12% nitrogen.

Aluminum microcircuits which have been prepared by reactive-ion etching are stabilized against open circuits and short circuits by treating the microcircuits in an oxygen-containing atmosphere at a temperature of from about 200.degree. C. to about 450.degree. C.

Via holes are etched in an alumina layer using an etchant bath of ethylenediaminetetraacetic acid at a pH above 9.

Pd/Sn seeds for use in electroless copper plating are accelerated by treating them with an alkali metal hydroxide at a pH of about 11.3 and at a temperature above 50.degree. C.

An ink for use in ink jet printing has as its coloring material a dye having the formula: ##STR1## where R is –OCH.sub.2 CO.sub.2.sup.-, –CH.sub.2 CO.sub.2.sup.-, –PO.sub.3.sup.= or –CH.sub.2 –PO.sub.3.sup.=.

A magnetic disk is lubricated by being overcoated first with a permanently bound monolayer of silica spheres about 7 nm in diameter and on top of said monolayer a skin-like film of amorphous silica about 2 to 13 nm thick.

A process for selectively depositing copper by first selectively depositing palladium seeds by irradiating a palladium compound with light. Following the deposition of the palladium seeds, copper is deposited by an electroless process.

A method of handling errors in the C bit of a storage key by modifying the INSERT STORAGE KEY (ISK) and the RESET REFERENCE BIT (RRB) instructions. If an error is found in the C bit during the execution of these instructions, microcode is instructed to refresh the C bit. The C bit is interrogated a second time to determine if the refreshed C bit is still in error. If the refreshed C bit is not in error a second time, then the first error was caused by a soft or transient error, and the instructi…