Stabilo pencils allow you to write easily on ceramic, glass, wood, paper, metal, etc.  Can be wiped off with water, though the red and orange pencils tend to leave ghost image of what is written.

Regards,
C. Payne

---- "Pickering wrote: 
> Does anyone have an suggestions for white ink that works well for
> numbering artifacts? I am not talking about ink to put down as a layer
> to write a number on, but white ink to use to write the actual number
> with.  
>  
> We have some of the white fluid acrylic ink from the Northern States
> Conservation Center http://www.collectioncare.org/shop/index.html , but
> have not been too happy with it. It does not seem to write well right
> out of the bottle, but needs to be fiddled with/diluted if using a dip
> pen. This gets to be tedious and time consuming if you have to do
> multiple numbers.
>  
> We mostly use black ink, and have some black that works for us. However,
> sometimes white ink is preferable for certain artifacts. 
> 
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