How to get depth of resin back>?

I filled voids and cracks in a live edge slab with tinted resin, and sanded down to flat.

Now the resin is dulled from the sanding and is significantly lighter in colour (from a black milky grey)

How do I get the depth of colour back? Wet sand and then polish?

I've never used resin as a filler before...

Answered your own question

Yes but how, as in suggestions of polish techniques or a resource to point me in the right direction?

wet sand up to about 3000, the polish with a metal polish such as Bowdens own or similar

I normally just sand to what ever grit your finishing your slab to and coat it as per normal.

lick your finger and run it over the epoxy you'll find it goes back to its normal color

for straight forward practical aussie advice, look at the number of posts each person has. China is on the money.