*** Posted by Luke ***
The question is about canopy.
As you know, the canopy of F-16 Fighting Falcon is coated with gold.

I have found some variants of canopy as follows;
1: All glass area is coated
2: Only front canopy is coated. Rear part is normal glass.
3: All glass area is not coated (normal glass)

Are these variants caused by different product-blocks ? Or no concerned ?

*** Posted by Justin ***
[The question is about canopy.
As you know, the canopy of F-16 Fighting Falcon is coated with gold.

I have found some variants of canopy as follows;
1: All glass area is coated
2: Only front canopy is coated. Rear part is normal glass.
3: All glass area is not coated (normal glass)

Are these variants caused by different product-blocks ? Or no concerned ?]

A reason for this is to reduce RCS

*** Posted by Andrew Spring ***
1: All glass area is coated
2: Only front canopy is coated. Rear part is normal glass.

When viewed from the front, ie by rader, the gold on the front canopy reduced the RCS and makes 'it' appear a lot smaller, obviously when viewed from the front the rear portion of the B/D cockpit is not important as far as the RCS is concerned.

The actual purpose for the gold tint is classified, you can verify this with any F-16 pilot. If it were to serve as a new glass for flash protection, you would see it on the new current age fighters, but you don't.