Printer grey ink made by titanium or other metals

[Mustafa Umut Sarac]

I think this is better idea than rock powder. As you know apug members desperately try to print their photos with nasty chemicals and platin or palladium or even with gold.
And everyone knows traditional method is to use silver .
And there are carbon particles or polymer dyes 4 greys inks for epson bw prints.
May be we can use black ink for the first cartridge and others filled with titanium , al or other grey metals.
First question , are they really grey ?
Second , is it possible to find without oxide form ? Titanium oxide is white but may be it is possible to find grey powder ?
Third , What is the biggest size of the particle which epson can jet ?
If you even print a paper white light on big basalt at aa picture with titanium oxide , i think it is something .
I am waiting your ideas .

Best ,

Mustafa Umut Sarac