Civil Engineering Reference
In-Depth Information
Recipe 2b: Ochre lime
The earth pigment ochre is soaked in two parts water overnight to become a pigment
pasta. The soaked pigment is then mixed with lime water in a proportion of 1:9 to become
a lime paint. The wall is first given a coat of lime water, followed by two coats of lime paint
and finally another coat of lime water.
Recipe 2c: Lilac, brown or green lime
This is made with the pigments ultra-marine, umber and burnt umber. The production and
application are the same as for ochre lime, above.
Recipe 3: Yellow lime with green vitriol
This paint has a certain antiseptic effect even in addition to the actual effect of the lime. A
solution of green vitriol and water in a proportion of 1:5 is made, then a separate mixture of
'wet' slaked lime and water is made in the proportions 1:5. The two mixtures are then stirred
together to become a thick porridge, and water are added. Before painting, the surface is
treated with one or two coats of lime water.
Recipe 4: Lime casein paint
By adding casein to the lime, a casein glue is formed which, apart from having a better
opacity, is also more elastic than ordinary lime paint. This is the type of paint that is used
in fresco painting and for wooden surfaces. The paint is waterproof. One part 'wet' slaked
lime is mixed with half to one part curd (containing about 12 per cent casein), and all the
lumps are pressed out. For a purer casein paint, four parts curd are used. The mixture is
added with 20-40 per cent stirred pigment of titanium oxide, ferric oxide, umber or green
earth and thinned out with skimmed milk. The surface is given a coat of lime water before
painting.
Recipe 5: Floor treatment with lime.
Lime treated floors are light and easy to maintain. First sand the floor and vacuum clean
it. Slaked lime and water are mixed in a proportion of 1:10. The gruel is brushed evenly
over the floor with a broom. When dry, the floor is sanded and vacuum clean again, then
washed with a 5 per cent solution of green soap in lukewarm water. Cleaning of the floor
is also done with a 5 per cent green soap solution, but soaps containing sulphates or
phosphates must not be used.
Silicate paints
Silicate paints have their origin in the binder potassium waterglass and were
patented in 1938 by A. W. Keim. They can be used on all mineral surfaces, but also
gives good results on rough wood. They can be used as an opaque paint or a
lazure paint. Waterglass paints react with lime on a painted surface and form cal-
cium silicate, which acts as a binder. The paint film forms a crystalline layer which
has a high resistance against acids. The best results are achieved on fresh render.
This paint is much more durable than lime paint and has a strong resistance to
