black to white gradient - what am I doing wrong ?

I have no issue with gradient tool while using foreground to transparency setting .

But when drawing black to white or foreground to background ( with black /White setting for those )
what I get is not 100% Black on the dark side of the gradient .

I understand that I'm doing something stupid, but what is that?

I have checked/unchecked dithering/ transparency etc .
checked the gradient spread and trashed my prefs .

I see this behaviour ( of getting the darkest parts at RGB 28/28/27 ) on 2 of my MACs - G5 10.4 and Intel 8Core 10.5

See this screen movie ( a bit flimsy, sorry ) :

<http://www.lipka.se/extras/gradient_not100black.mov>

Thanks you for any suggestions .

in the gradient picker it click on the black swatch on the gradient and make sure that its as black as it can be.

OK , Indeed ,
Thanks Buko.

it worked . for some reason starting point
for gradient named " Black, White " was not RGB 000 , Strange I took it for granted that it was supposed to start at Black . Thanks again.

glad I could help.