topic Gray stained chroma optimizer on imagePROGRAF PRO-4000 in Production Printing https://community.usa.canon.com/t5/Production-Printing/Gray-stained-chroma-optimizer-on-imagePROGRAF-PRO-4000/m-p/569748#M2857 <P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>On my Canon pro-4000 the chroma optimizer prints with a light gray stain.&nbsp; A nozzle check pattern photo is attached.<BR />What are the likely causes of this?&nbsp; Is it a bad print head or perhaps a leak elsewhere in the system?</P><P>Matte prints are fine since they don't use CO but anything on gloss or luster is unusable.<BR />Thanks in advance!</P><P><BR /><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="canon pro-4000 nozzle check sm.jpg" style="width: 800px;"><img src="https://community.usa.canon.com/t5/image/serverpage/image-id/70374iF26DB331499D19CE/image-size/large?v=v2&amp;px=999" role="button" title="canon pro-4000 nozzle check sm.jpg" alt="canon pro-4000 nozzle check sm.jpg" /></span></P> Mon, 29 Sep 2025 16:44:22 GMT prairiedust 2025-09-29T16:44:22Z Gray stained chroma optimizer on imagePROGRAF PRO-4000 https://community.usa.canon.com/t5/Production-Printing/Gray-stained-chroma-optimizer-on-imagePROGRAF-PRO-4000/m-p/569748#M2857 <P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>On my Canon pro-4000 the chroma optimizer prints with a light gray stain.&nbsp; A nozzle check pattern photo is attached.<BR />What are the likely causes of this?&nbsp; Is it a bad print head or perhaps a leak elsewhere in the system?</P><P>Matte prints are fine since they don't use CO but anything on gloss or luster is unusable.<BR />Thanks in advance!</P><P><BR /><span class="lia-inline-image-display-wrapper lia-image-align-center" image-alt="canon pro-4000 nozzle check sm.jpg" style="width: 800px;"><img src="https://community.usa.canon.com/t5/image/serverpage/image-id/70374iF26DB331499D19CE/image-size/large?v=v2&amp;px=999" role="button" title="canon pro-4000 nozzle check sm.jpg" alt="canon pro-4000 nozzle check sm.jpg" /></span></P> Mon, 29 Sep 2025 16:44:22 GMT https://community.usa.canon.com/t5/Production-Printing/Gray-stained-chroma-optimizer-on-imagePROGRAF-PRO-4000/m-p/569748#M2857 prairiedust 2025-09-29T16:44:22Z