Agfa Viradon???????

Hi All,

Have just tried Agfa Viradon to try and brown tone my photograph to make it
look like an old picture
as it was taken on an old camera.
The paper used was Ilford multigrade 1V RC size 16" x 12" well washed.
The instructions said dilute at 50 -1 and immerse print for 2 to 10 minuets.
After 20 minuets nothing had happened so I increased the strenght to 1-25.
After 45 minuets still nothing had happened to the print, but the viradon
went all "murky"

Could someone please explain why my print wouldn't tone, also I tried to
tone in some sepia after but it
wouldn't sepia either. Why?????????

Thanks in advance