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[–] CarthOSassy ago 

It's a good idea. Literally. The killogram is an idea, now. It is possible to repeat the construction of the killogram, by reading a description of it.

No longer do we need to pass around a chunk of metal that is changing mass unpredictably.

Now you can write down the killogram and share it. Carve it in a rock face, and it will last thousands of years. Whereas the previous version has changed over a few centuries even in a hermetically sealed jar.