Quote Originally Posted by amaury217 View Post
In fact I can not get a satisfactory contrast in my prints , there is always like a gray veil
contrast is not correct even a grade 5
Two things spring to mind:

Poor safelight - Have you done a check to see if it is truly safe and that there are no light leaks in your darkroom ?

Are you using fresh, new paper - Old papers that have been stored badly can often show the effects you describe.