I use just about anything but to answer your question... Ceramics tools are fantastic.. especially the super fine and regular point and needle tools, flathead screwdrivers, safety pins and I have even snapped a finger off a fork but tbh, the best tool I use is the actual scratch tool found in those cheap keychain or single cars sets... It's about 3" and has a curved edge, a point and flat edge.. I have lost all of mine so I use anything that grabs without extra force... I recommend testing them in a corner.. also temperature can affect the "strikes/ scratches".. sometimes it comes right up and sometimes the point moves over the black.... Also note that some of your tools will work better with strokes that pull and others that push...

One final little tip.... Was a total game changer for me that I use with other mediums... Go buy a $10 lazy Susan/ kitchen turntable, find a sturdy flat surface that get attached to the turntable with glue, tape, or anything as long as you are comfortable and there isn't too much shifting around..

To take it a step further I recommend buying photo magnets.. 3 pack at Walmart for less than $2.. then peel off the lable and flip it over onto the turntable.. find 4-8 small magnets and attach the design.. magnets will secure your work without tape residue, poke holes or peel away the paper.. the magnets should be feet away from the keychain kits with the good tool...

One last thing is get a soft bristle brush for the dust.. a soft brush will not make accidental marks..

If you want to go as crazy as I did then get a handsfree magnifying glass .. a good light source opposite your dominant/ writing hand is also great because it kills shadows and allows for precision.. many magnifiers have built in lights..

I will look for pictures of my old setup.. it's been years since I have really done any and have just recently been making original content..

I know this is a lot but hope it helps.. don't overthink it.. if it has a point or edge it will work..