Do you recall a few years back there was a sort of scandal surrounding
one of the major paint manufacturers whose "brilliant white" turned to a
sort of sepia/magnolia shade in a matter of a few months. I'm about to
buy a large amount of brilliant white and want to avoid the wankers that
made the bad stuff (and refused to compensate those who used their rotten
old paint in good faith). I *think* the guilt party was either Crown or
Dulux but can't recall which - if either. Can anyone help me out here?
Traditionally the main white pigment in paint was white lead (basic
lead carbonate, 2PbCO3.Pb(OH)2), but in sulphurous city atmospheres it
would discolour and darken over time (the walls of our chemistry labs
at school had at one time been inadvertently painted with a lead-based
paint; they soon went blotchy brown from all the H2S in the air, and
this discolouration kept bleeding through subsequent coats of paint
even though these were not lead-based). An assortment of other white
pigments have been used, but titanium dioxide is now the most common
pigment, often in combination with zinc oxide.
"White lead mixes well with linseed oil - with which it has what is
sometimes described as a natural affinity-other oils, and turpentine.
It is used both as a white paint and as a base for mixed paints, for
interior or exterior application. For certain purposes, such as, for
example, on outside woodwork, it has few equals and no superior."
I dragged an old (20 year?) tin of white undercoat out of the shed a
couple of days ago, there was a deep layer of what smelt like linseed
oil on top, and the solids were beige and lumpy like curdled milk, it
mixed back together pretty well and became white, no problems at all
using it ...
The problem nowadays is that much paint is basically brand engineered, so
its often hard to know which is the best.
A friend recons paint made by Valspar is very good, but I'm sure it was
recently brand puurchased by one of the DIYSheds, so is probably just like
all the others!
From the Sofa of Brian Gaff Reply address is active
"Tim+" < email@example.com> wrote in message
On Fri, 29 May 2015 19:27:19 +0000 (UTC), Cursitor Doom
It was a problem of around 10 years ago, when the paint was
reformulated to comply with a change in European regulations. I think
that it only affected gloss. Crown, who I had just finished working
for, labelled their tins with a warning that the colour might not be
stable but Dulux didn't, hence the story Jonno linked to.
(I had a litre of Crown gloss that discoloured but most of it's been
repainted since, and that which hasn't can't be seen until I open one
Here is something that I posted in this forum 2 years ago. It might be
" My son has bought new primed cast iron drain pipes to replace the
120yo ones that have rusted away. He wanted to match the original paint,
which was a sort of matt white. I went to a local supplier who provided
5L "Johnstone's flat oil-based brilliant white".
Son painted 2 coats in his garage and said the paint seemed excellent,
and I admired the results when I visited.
Then on Monday he finally read what it said on the tin and sent me an
email expressing, shall we say, dismay. The tin and the datasheet
"A solvent-borne, traditional matt finish formulated for interior
use. Based on an alkyd resin it provides excellent obliteration
and flow characteristics and produces a smooth even finish
with excellent durability".
I rang and spoke to the Johnstone's technical support desk, who said the
formulation was exactly what they would use for an exterior paint, and
the reason it said "Interior" was that getting it independently
certified for "Exterior" was a long and expensive process, so hadn't be
done for this paint.
I then asked about yellowing and they said that yellowing would only
take place in low light conditions indoors eg on skirting boards and
that the paint would be fine used externally in natural UV light.
So we have a paint sold as interior that is better as an exterior paint.
I blame the EU."
2 years on, he has one section of drainpipe fixed to the wall and the 2
hoppers. The scaffolding tower had to be moved to another part of the
grounds for a more urgent job. The paint has not yellowed.
Maybe, but it is what happens (or did with the older solvent borne gloss
In our old house, bought in 1997, and not really redecorated for some
years, there were yellowed shield shaped areas on the white glass
painted panelled stairway
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