Faded image on Crystal photo blocks

[Mugshot]

Hi, I normally just print mugs but thought I would try printing on crystal photo blocks.
Print to the suppliers guidelines. 185° and 270 seconds.
But upon removing the the block the image is faded. Put back under the press and find the image colour has improved.
Try the next one same thing, but after the extra time, there is no change to the image colours. Have tried extra pressure on the press to no avail.
Any ideas to help solve the issue?
Thanks

[Dowster77]

Hi, I normally just print mugs but thought I would try printing on crystal photo blocks.
Print to the suppliers guidelines. 185° and 270 seconds.
But upon removing the the block the image is faded. Put back under the press and find the image colour has improved.
Try the next one same thing, but after the extra time, there is no change to the image colours. Have tried extra pressure on the press to no avail.
Any ideas to help solve the issue?
Thanks

.Hey I have this problem sometimes so I move the blocks over to the side a little.

Hope this helps