Selective colouring Sywell in 720nm

I liked the blue in this after reversing the channels from a 720nm shot, but thought the water tower would look better in B&W so had some fun with layer masks in Photoshop.

Camera model:Canon 450D - Full spectrum

Focal length:15 mm

Max lens aperture:f/5.4

Exposure:1/100 at f/9

Flash:Not fired, compulsory mode

Exposure bias:-1 EV

Exposure mode:Auto

Exposure prog.:Aperture priority

ISO speed:ISO 100