UV ink blemish?

I recently acquired two of these notes, and the serial numbers are more than 1000 apart.

Unlike the £10 and the £20 I have, the two £5 notes have UV ink anomalies. They look like production UV ink smears. I am interested to see which serial number ranges (if any) do not have these smears. See the vertical green lines above the top left corner of the 5 block:

Interesting. Similar anomalies occur occasionally in visible ink on banknotes, so I guess they are to be expected in UV active ink also.

They should also be more common because of the invisible ink.

I asked the seller in the Falkland Islands to see if there is a range of serial numbers that don't have these smears. So far, no reply.

I'm bumping this because I would like to know if anyone has a clean £5 note under UV. If so, what was the serial number?

When you have a moment, could you add your notes as images in the pages for these Falkland Island notes - we have only BNM fillers currently.

Will do, it's on my list. I added the UV images for the £10 and £20 because they were already cropped. The plain scans haven't been fixed yet, might have to wait until after my annual leave. I'll be away for a few weeks.

odd job

Will do, it's on my list.

👍

I found a similar blemish on three of these notes:

5 Piso (Lorenzo Ruiz) - Philippines – Numista

Same area also, it streaks away from the top left corner of the UV denomination block:

I have a prefix H example of this note that doesn't have this blemish, but the UV denomination block looks faded on that note when compared to the J prefixes above. 

So I am now wondering how they replenish the UV ink and whether that process can result in a blemish as seen in the three notes above and the two Falkland Islands notes earlier.