Botched marble repair - wrong colour! Fillers, sealants and adhesives for all types of DIY work. Help, advice and information on all aspects of this subject

[Jude212]

I have repaired a broken piece of marble using jolly mastic filler.

However, I have not got the colour right (much too light) and now have a very visible white line running through my marble.

Is there any way to salvage this? I know that colour can be added to filler prior to application, but now that it has dried is there any way to stain the filler?

Any advice would be greatly appreciated!