patch colours and plot colours

I am having an issue using :

patch

and using:

plot

Specifically when using patch:

figure(1)
patch(vert_x,vert_y,'yellow');

But when using plot on a polygon obtained using polyshape, denoted by the variable name object1:

figure(2)
plot(object1,'FaceColor','yellow');

The output is correct, but the yellow obtained from figure 2 is noticeably lighter in color than the yellow which is obtained in patch. I want the colors to look the same. How can I overcome this issue? I have tried RGB colors and this has not fixed the issue.

[Pa342]

Okay so the solution was to use:

'FaceAlpha',1

In other words,

plot(object1,'FaceColor','yellow','FaceAlpha',1);

For some bizarre reason, the brightness of two plot methods have different settings, even when using the same colors.