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Help - Colour Matching

Hi there, I have just moved into a new place in Hobsonville and need some help. I am looking to touch up the door frame which is white and semi-glossy but since there are 100s of variations of the white colour I need some help from someone with experience to colour match so I can buy my own tin of paint from the likes of Resene/Dulux and do my own touch up. The house was built overseas so no real documentation from anyone or the developer as to what the exact colour is hence the reason for someone with experience to help colour match.