Red plaster

[Jock74]

After scraping the wallpaper off our hallway walls the plaster underneath has red colour through it.
I notice if it’s damp it stained my fingers red so just wondering if anyone can tell me what this is and if any steps were needed before I painted over it?

 

[Wayners]

Rub with meths. Probably come off easy as I think that's red emulsion. Meths Is a mild paint stripper.
Can get a better look at what's under which looks like multi finish plaster to me

 

[ree]

OP,
Sand off every trace of the old wallpaper before doing anything else.
Ask on the painters forum for how they would treat the coloring.
There's no "multi finish plaster" or any other finish plaster showing?

 

[RandomGrinch]

It looks a little like the rather colourful distemper I found, when I removed the wallpaper from my lime plastered Victorian walls.
If it were distemper, a test would be to wipe it with some warm soapy water on a sponge - the sponge will quickly change colour if it is!

 

[Alastairreid]

Don't sand anything as that looks like old artex under the red emulsion.

 

[ree]

Poster #5,
What nonsense - stop with the scaremongering.
Please explain why: "that looks like old artex under the red emulsion"?
Why do you say its emulsion?