Quote:
Originally Posted by Snapolit1
Maybe just certain photos. See below from their website.
As part of our Autograph Authentication service, you will have the option of having the item encapsulated in one of our tamper-evident holders (holder sizes permitting) or certified with documentation. With that said, please make sure you are completing the appropriate form as there is one form for items you wish to be encapsulated (“Autograph Encapsulation Submission”) and one for items that do not require encapsulation (“Autograph Submission”). Please refer to the top-right corner of the form for the submission type.
When an item is certified with documentation (not encapsulation), we will apply our invisible, synthetic, DNA-laced ink to the item, in conjunction with our tamper-evident label and matching Certificate of Authenticity (COA) or Letter of Authenticity (LOA). This PSA/DNA security matrix will identify your collectible as certified.
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It's done with autographed items in general... not limited to photos.
And no, there are no "invisible markings" done to slabbed cards.