The new number plates can also only display solid black lettering. Two-tone number plates that used different shades to create a 3D or 4D effect have been banned.
The lettering can still be Perspex or acrylic lettering, provided it meets all other requirements. They must, however, be black and cannot have different colour sides.
That contradicts itself by saying 4D effect has been banned, but lettering can still be perspex or acrylic???
I'd say there is confusion between what had always being know as 3D effect by means of 2 dimensional shading, and what is now referred to as 4D, which is actually stuck on 3 dimensional lettering.