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<blockquote data-quote="Marguerite" data-source="post: 262092" data-attributes="member: 1991"><p>Actually, there's some good suggestions in that - if you absolutely must repaint the walls after this, do a bit of investigating first (I know husband will advise you too) and use something that will allow for easy graffiti removal.</p><p></p><p>The eggshell paint - like a lot of surface finishes, especially if applied thinly or the older, more 'natural' finishes, the graffiti actually can be absorbed into the surface coating and will bleed through.</p><p></p><p>On the subject of felt pens and the way the ink bleeds, you can set up an experiment with the kids on colours, pigments and how they are combined. Use water-soluble markers in a range of cours (get the kids to choose the colours) and you get paper (blotting paper is great, but any absorbent paper will do, even from the printer). Draw a line in pencil about 3" up from the end of the sheet of paper, and put big dots of colour 1" apart along this line. Then stand the sheet of paper in water (you either lean the sheet of paper against the side of the dish so the paper is upright, or staple the paper into a cylinder with the pencil line one one end of the cylinder). The cylinder method is a bit better because what you want, is the water to wick up through the paper, against gravity. The water carries the ink pigments with it to a certain point according to the weight of each individual colour. You will see the different colours separate out, the lighter ones going up higher. Black is especially interesting, it's often made up of three or more colours.</p><p></p><p>At the end of the experiment, draw a pencil line to indicate how far up the ater went, then draw a pencil line around each colour that has separated out. You do thisbecause as it dries, some may fade.</p><p></p><p>If they like this, then you can go to town with a chlorophyll experiement, but this is a little more complex. You first need to get some green leaves off the tree and put them in a blender with some hot water. Alternatively, chop the leaves up and soak them in some alcohol (rubbing alcohol is fine for this; if you're rich you can use vodka. if you're really rich, use gin.)</p><p></p><p>THen make the paper cylinder as above (although because you're only using one substance, a paper strip should be OK). Dip one end in the solution and have the solution climb up the paper. You will see that chlorophyll is made up of different components and differentcolours which separate out. Different leaves (with different shades of green) may give you some differenr results. Howver, some of thecomponents are very pale, a UV light can show them up a little more, before they fade out entirely.</p><p></p><p>The moral of the experiment - the ink in felt pens will bleed through and can be very concentrated. They can also be complex, according to which colour was used. So never expect an easy clean-up, felt pen inks can be surprising.</p><p></p><p>Those new 'magic eraser' sponges are great, if the ink hasn't penetrated into the paint they are worth a try. But don't use anything other than water on them, they could dissolve with the wrong solvent. Crayon is a wax, it should rub off. Alcohol will risk dissolving a wax which WOULD remove it but could also carry the pigment into a surface. You can also remove wax with heat and absorbent paper - again, I would try the magic eraser first, with a wax crayon. There is also a chance it could work with permanent marker, as long as it hasn't penetrated the paint. If it has, then before repainting, sand it back until the mark is gone. If you have repainted and the mark is bleeding through, then again - sand it back before you ever try to add any more coats. Sorry - you may even have to sand back to below the undercoat, if the ink has run through.</p><p></p><p>Marg</p></blockquote><p></p>
[QUOTE="Marguerite, post: 262092, member: 1991"] Actually, there's some good suggestions in that - if you absolutely must repaint the walls after this, do a bit of investigating first (I know husband will advise you too) and use something that will allow for easy graffiti removal. The eggshell paint - like a lot of surface finishes, especially if applied thinly or the older, more 'natural' finishes, the graffiti actually can be absorbed into the surface coating and will bleed through. On the subject of felt pens and the way the ink bleeds, you can set up an experiment with the kids on colours, pigments and how they are combined. Use water-soluble markers in a range of cours (get the kids to choose the colours) and you get paper (blotting paper is great, but any absorbent paper will do, even from the printer). Draw a line in pencil about 3" up from the end of the sheet of paper, and put big dots of colour 1" apart along this line. Then stand the sheet of paper in water (you either lean the sheet of paper against the side of the dish so the paper is upright, or staple the paper into a cylinder with the pencil line one one end of the cylinder). The cylinder method is a bit better because what you want, is the water to wick up through the paper, against gravity. The water carries the ink pigments with it to a certain point according to the weight of each individual colour. You will see the different colours separate out, the lighter ones going up higher. Black is especially interesting, it's often made up of three or more colours. At the end of the experiment, draw a pencil line to indicate how far up the ater went, then draw a pencil line around each colour that has separated out. You do thisbecause as it dries, some may fade. If they like this, then you can go to town with a chlorophyll experiement, but this is a little more complex. You first need to get some green leaves off the tree and put them in a blender with some hot water. Alternatively, chop the leaves up and soak them in some alcohol (rubbing alcohol is fine for this; if you're rich you can use vodka. if you're really rich, use gin.) THen make the paper cylinder as above (although because you're only using one substance, a paper strip should be OK). Dip one end in the solution and have the solution climb up the paper. You will see that chlorophyll is made up of different components and differentcolours which separate out. Different leaves (with different shades of green) may give you some differenr results. Howver, some of thecomponents are very pale, a UV light can show them up a little more, before they fade out entirely. The moral of the experiment - the ink in felt pens will bleed through and can be very concentrated. They can also be complex, according to which colour was used. So never expect an easy clean-up, felt pen inks can be surprising. Those new 'magic eraser' sponges are great, if the ink hasn't penetrated into the paint they are worth a try. But don't use anything other than water on them, they could dissolve with the wrong solvent. Crayon is a wax, it should rub off. Alcohol will risk dissolving a wax which WOULD remove it but could also carry the pigment into a surface. You can also remove wax with heat and absorbent paper - again, I would try the magic eraser first, with a wax crayon. There is also a chance it could work with permanent marker, as long as it hasn't penetrated the paint. If it has, then before repainting, sand it back until the mark is gone. If you have repainted and the mark is bleeding through, then again - sand it back before you ever try to add any more coats. Sorry - you may even have to sand back to below the undercoat, if the ink has run through. Marg [/QUOTE]
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