HP Latex R2000 Printhead Optimizer Alignment

[Evh.ink]

Hello,
Maybe a basic question but does anyone have any suggestions when it comes to printing legible White+OP manual alignment plots on an HP Latex R2000. We usually use scrap dark blue SAV which shows the white ink passes but the optimizer is never readable. Thanks.

 

[balstestrat]

I use red or you can also do transparent.
Just shine some light on it and look for the average.