Identifying a Male Orange Tip butterfly is reasonably easy, on top of the outer wings is a bright orange colour
On the underside of the wings of the male there are some green mottled markings and the orange shows through from the top of the wings quite well
In fact the underside markings are a good form of camouflage
The female Orange Tip can be difficult sometimes especially if you don't get to see the underside of the wings. On top of the female outer wings, the orange is replace by a washed out dark grey.

The underside of the female is where you can positively identify the female Orange Tip as the mottled green markings are the same as the male.
That said, where the problem comes with identifying the female Orange Tip sometimes, especially if you only see the top of the wings or only get a fleeting glance. The first one below is an Orange Tip female.......
.....which is similar to the top side of the wings of the Green-veined White Butterfly as shown below.
Slightly less grey on the outer wing tips.
You get to positively identify the difference between the female Orange Tip and the Green-veined White by observing the green veins on the underside of the Green-veined White. In various stages of the life of these two female species they change somewhat, which makes it even more difficult unless you get to see the underside of the wings.
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