Hi Guys n girls
I'm sorry i was so happy to get the photo's up i did not explain much.
It is indeed on the outside,does not go through to the inside,it dissapears when washed only to return.
The best way i can discribe it is like a mould,not paint splatters & not a water mark to be seen.
Only shows on the textured design not the smooth,should i try turps or such,was too scared untill you peoples had a look.
I'm guessing art deco,cezch?