"Martin Brown" wrote in message
...
On 10/01/2019 20:17, tim... wrote:
Went into a store (I won't name it because it mighty not be the store's
fault, could be a generic problem with this product) with a sample of the
emulsion paint that I wanted, painted on to a piece of plasterboard (of
the same type that I expect to be painting onto).

now that I have opened the tin and painted the the walls (well a bit of)
the colour has dried out to be closer to that of the base colour of the
plaster board than the colour that I pained on.

Try a second coat on the same area before giving up. The first coat is
likely to still show some of whatever is underneath it through.

No, it's just too different to the bit of the wall that I painted from the
dregs of the previous tin, that I (also) used to create the sample.

I guess that the emulsion is translucent to the laser device that they
use to determined the colour mix and I got a result tainted by the colour
of the backing?

Emulsion tends to need (at least) two coats to entirely obscure the
material that it has been painted onto.

going back tomorrow with the same painted onto some gloss white paper.

bugger is I bought 10L of it

Oops. Colour matching is something of a challenge. I prefer to take away
shade cards

It's a discontinued paint and there are no cards for it. I know its name
but it wasn't on their database (turns out it was on a trade store database,
I wish I'd known that yesterday)

I tried, but I couldn't find a current paint sample card to match

I'm more annoyed that I lost a 4 hour painting session at the house, where
because it was full of gas fitters, there was little scope for more
complicated work, than the 60 quid cost.

tim