Removing turmeric colour from mortar and pestle We have a large granite (I think) mortar and pestle, and while keeping it clean generally doesn't seem too difficult, I have absolutely no idea how to avoid it staining when it's used with turmeric powder when cooking curries.

Generally, we'll ground the spices then add garlic and a little water to create a paste which is then fried; the only solution I can think of to avoid the yellow stain is to add the turmeric separately to the pan and leave it out of the mortar entirely. Would this work satisfactorily, or is there a way to get the colour from the mortar?
Turmeric is an intense stain. I would use a little bit of bleach, let it sit until the stain disappears, then wash the mortar very thoroughly. Another option is just to accept that the mortar may develop colors over time, and think of it as character.