The pen is blue

[Ju]

1. The pen is blue.
2. The pen is in blue.

Are the above sentences grammatically correct and they both mean the same?

 

[emsr2d2]

If you're simply trying to describe the colour of the main body of an actual pen, use #1. The other one doesn't work for that.

We might use "in + colour" when talking about painting. For example, "I'm going to paint a picture of my office. I'll do the desk in red, the pen in blue, the chair in purple, the computer in yellow and the carpet in green with yellow spots. In reality, my office is black and grey but I want to make it look more colourful in the painting".

 

[teechar]

Are the above sentences grammatically correct

They are.

and do they both mean the same?

No.
#1 talks about a pen that is blue in colour.
#2 talks about a picture/painting of a pen that was painted/drawn in blue.

 

[Rover_KE]

Are the above sentences grammatically correct and do they both mean the same?

 

[Charlie Bernstein]

. . . Are the above sentences grammatically correct, and do they [STRIKE]both[/STRIKE] mean the same thing?

Now you know!

 

[PeterCW]

If we want to refer to the colour of the ink in the pen we would normally call it a "blue pen". If we meant the colour of the body we would have to put the statement into context.

 

[Raymott]

"... and do they mean the same [thing]?" It's very unlikely that only one would mean the same.