f79r - something written under water ???

[Rafal]

I think there could be some writing or something like that under blue paint in one part of You are not allowed to view links. Register or Login to view. folio.

I altered the picture with graphic editor changing stuff like hue, contrast etc. :
   

For me it seems a bit like letters " k o ń r "
"Koń" is "horse" in Polish but I wouldn't go that far 

Do you see something too or is it just some random noise for you?

[eggyk]

I think there could be some writing or something like that under blue paint in one part of You are not allowed to view links. Register or Login to view. folio.

I altered the picture with graphic editor changing stuff like hue, contrast etc. :


For me it seems a bit like letters " k o ń r "
"Koń" is "horse" in Polish but I wouldn't go that far 

Do you see something too or is it just some random noise for you?

I believe that we are looking at something akin to a fire (perhaps to warm the bath?) along with a hose to feed the water.

       
   

But I can also make it look like a fish if i wish to, so I would take everything with a pinch of salt.

   

[ololololo]

The protruding round part resembles a hole. Perhaps it is connected to a hole at the bottom or to a small object beneath the paint.
But I like eggyk’s theory about heating up the sauna...

[Oscroft]

I think there could be some writing or something like that under blue paint in one part of You are not allowed to view links. Register or Login to view. folio.

I altered the picture with graphic editor changing stuff like hue, contrast etc. :


For me it seems a bit like letters " k o ń r "
"Koń" is "horse" in Polish but I wouldn't go that far 

Do you see something too or is it just some random noise for you?

Hmm, yes, that's interesting. I tried converting to monochrome and inverting (which can often help with old text documents), but that didn't give me anything in this case.

I can't really identify letters in it myself - but I'm also not quite convinced it's random noise.

[nablator]

My attempts with DStretch filters:

       

The final "r" stands out but what is before it remains unreadable.

[Rafal]

The final "r" stands out but what is before it remains unreadable.

Yes, that "r" (let's call it so) is very real. But frankly I have no idea what could it be.

[nablator]

But frankly I have no idea what could it be.

I do have an idea but it's more imagination than real pixels.

   

[Koen G]

How about "por"?

[MarcoP]

Contrast-enhanced saturation channel from the old Beinecke scans.
I don't know what to make out of this: the circle at the top appears to be totally obscured by the blue paint, so it doesn't seem that ink below the paint can show up? 

   
   

[Koen G]

Miultispectral imaging of q13 could still teach us a few things.