repointing mortar tinting?

[steponmebbbboom]

Hi, I'm wondering how I can mix mortar for repointing my brick to match the colour of the mortar that is already there. I do not know if the original mortar was tinted or if it has darkened red from the rain eroding and washing brick pigment over the mortar, but what I do know is that all repointing that has been done to the house sticks out like a sore thumb due to the drastic colour differences. This is an original exterior wall that sits inside a rear porch addition, that was exposed by a previous owner:



If anyone has suggestions or experiences regarding brick sealer coatings, that would also be appreciated.

[stuart45]

Looks like it might have been colour washed, which was an old method used on brickwork. It was done with a mix of Alum, Copperas and Red Ochre for that colour.