they want you to jump thru hoops and bark like a dog as well?
i dont think you can fulfill every thing without going nuts.
* Secure - The chances of accidental removal of the label or mark from the object must be extremely low;
* Reversible - It should be possible for a label or mark to be removed intentionally from an object, even after 50-100 years with as little trace as possible;
* Safe for the object - Neither the materials applied to the object nor the method by which they are applied should risk significant damage to the object;
* Discreet but visible - The recommended methods should not spoil the appearance of the object, nor obscure important detail. However, the number should be visible enough to reduce the need to handle the object;
* Convenient and safe for staff and volunteers - Materials should be easily available in small quantities at a reasonable price, and should not pose significant risks to health if used in accordance with the guidelines recommended by a local CoSHH risk assessment.
* Avoid physically unstable surfaces. Also avoid placing labels or marks across a line of weakness or fracture;
* Avoid applying any self-adhesive label or tape, such as SellotapeTM, to the surface of an object. If a glued-on label is the most appropriate technique to use, follow the procedure outlined in Basic Techniques: Glue-on label;
* Choose a position so that the number is unlikely to be visible when the object is on display;
* Avoid decoration and painted/varnished/pigmented/waxed areas;
* Avoid surfaces where the mark is likely to be at risk from abrasion, such as surfaces on which it normally rests, or where touched during handling;
* Mark all detachable parts of an object (using suffixes to the Object number);
* Locate the number so that the handling necessary to read it is minimised. (Consider marking the packaging or adding an extra tie-on label as well.);
* With composite objects, mark the part on which the most secure method can be used;
* Where duplicate marks are made these should be in different positions on the object (bearing in mind, of course, the other principles listed above).
Here's what i would do. I would keep using barcodes as that seems like a good idea.
I would also try using string/tag method. Most loose computer parts have
mounting holes you can just tie it to that. it would'nt be too big a deal
just tuck it under the item when on display. if worried about the tag
wearing out just laminate it.
You might also looking into RF tags. they are small about size of a stamp
and can be read without even touching the item. However they do cost
anywhere from 25cents -> 1.00+.. good luck