MJ on sun 21 aug 11
Hello all - I have been looking at mason stains for use in colored slips.
Based on a bit of reading, I believe that some of the mason stains are
encapsulated (largely the ones with cadmium) and others are "standard" so I
am guessing not encapsulated. My question is related to the safety of the
standard stains. For example, there is a turquoise stain number 6364 that
(per the MSDS sheet on the mason stain website) contains silica, vanadium
trioxide, zirconium oxide. If you use a "standard" mason stain that is not
encapsulated and contains these materials, in a slip which you use on
greenware and then cover with a good clear (food safe) clear glaze, is this
acceptable for functional ware? My ultimate firing schedule would likely b=
e
cone 5 with holds yielding an approximate cone 6 firing.
For now, I am considering using it on luminaries so they are not useable fo=
r
food or liquids as they have many holes in them, but it would be great to b=
e
able to use them for food surfaces as well.
I have seen testing facilities for cadmuim and lead, but how about things
like vanadium, etc. As I am an extremely small shop, I cannot really affor=
d
a lot of lab testing. I can do a leaching test with vinegar but I wonder i=
f
that is enough. Curious to hear about other experiences. What other tests
could I do at home?
Also, I am curious to know if I should always wear gloves when working with
the colored slip? I know I should wear a mask when mixing the slip.
I did search the archives and there seems to have been a few discussions,
but primarily related to cadmium. As always, any help is appreciated.
Cheers, MJ
Steve Mills on mon 22 aug 11
In interpreting and writing MSDS, one of the most important things to remem=
b=3D
er is; a material on its own may have a high risk factor, but in dilution, =
t=3D
hat risk is often VERY reduced.=3D20
In a slip for example, the material concerned is not only diluted by the sl=
i=3D
p as a carrier, but the area in contact with a glaze is yet again reduced. =
T=3D
hus in an addition of 10%, the final glaze contact area could possibly be l=
o=3D
wer than 2%.=3D20
In a Glaze, dilution by water must also be taken into account when calculat=
i=3D
ng risk factors. =3D20
When handling ANY powdered Ceramic Material, it is wise to wear Breathing P=
r=3D
otection, and Hand Washing afterwards is a must. This is why the consumptio=
n=3D
of food and drink in a workshop environment is discouraged.=3D20
Steve M
Steve Mills
Bath
UK
www.mudslinger.me.uk
Sent from my Ipod touch
On 21 Aug 2011, at 18:39, MJ wrote:
> Hello all - I have been looking at mason stains for use in colored slips.
> Based on a bit of reading, I believe that some of the mason stains are
> encapsulated (largely the ones with cadmium) and others are "standard" so=
I=3D
> am guessing not encapsulated. My question is related to the safety of th=
e=3D
> standard stains. For example, there is a turquoise stain number 6364 tha=
t=3D
> (per the MSDS sheet on the mason stain website) contains silica, vanadium
> trioxide, zirconium oxide. If you use a "standard" mason stain that is n=
o=3D
t
> encapsulated and contains these materials, in a slip which you use on
> greenware and then cover with a good clear (food safe) clear glaze, is th=
i=3D
s
> acceptable for functional ware? My ultimate firing schedule would likely=
b=3D
e
> cone 5 with holds yielding an approximate cone 6 firing.
>=3D20
> For now, I am considering using it on luminaries so they are not useable =
f=3D
or
> food or liquids as they have many holes in them, but it would be great to=
b=3D
e
> able to use them for food surfaces as well.
>=3D20
> I have seen testing facilities for cadmuim and lead, but how about things
> like vanadium, etc. As I am an extremely small shop, I cannot really aff=
o=3D
rd
> a lot of lab testing. I can do a leaching test with vinegar but I wonder=
i=3D
f
> that is enough. Curious to hear about other experiences. What other tes=
t=3D
s
> could I do at home?
>=3D20
> Also, I am curious to know if I should always wear gloves when working wi=
t=3D
h
> the colored slip? I know I should wear a mask when mixing the slip.
>=3D20
> I did search the archives and there seems to have been a few discussions,
> but primarily related to cadmium. As always, any help is appreciated.
>=3D20
> Cheers, MJ
Birgit Wright on mon 22 aug 11
Hi MJ=3D3B I did a cadmium test at BSC Labs=3D2C http://www.bsclab.com/ . =
It =3D
cost about $18.00 plus shipping=3D2C for the cadmium=3D2C they test for lo=
ts o=3D
f other things=3D2C if you call them they can tell you what they are and ho=
w =3D
much.
Cheers=3D2C Birgit Wright.
=3D20
=3D20
=3D20
=3D20
> Date: Sun=3D2C 21 Aug 2011 10:39:25 -0700
> From: mjcarizona@GMAIL.COM
> Subject: mason stain slips
> To: Clayart@LSV.CERAMICS.ORG
>=3D20
>=3D20
> I have seen testing facilities for cadmuim and lead=3D2C but how about th=
in=3D
gs
> like vanadium=3D2C etc. As I am an extremely small shop=3D2C I cannot rea=
lly =3D
afford
> a lot of lab testing. I can do a leaching test with vinegar but I wonder =
=3D
if
> that is enough. Curious to hear about other experiences. What other tests
> could I do at home?
>=3D20
> > Cheers=3D2C MJ
=3D
Ron Roy on mon 22 aug 11
Hi MJ,
It is not expensive to have glazes tested - let me know where you are
and I will send the info you need.
If you want me to look at your glaze(s) to see which are the most
stable just send me the recipe.
This is not as complicated as it seems - and vanadium does have it's proble=
ms.
RR
Quoting MJ :
> Hello all - I have been looking at mason stains for use in colored slips.
> Based on a bit of reading, I believe that some of the mason stains are
> encapsulated (largely the ones with cadmium) and others are "standard" so=
I
> am guessing not encapsulated. My question is related to the safety of th=
e
> standard stains. For example, there is a turquoise stain number 6364 tha=
t
> (per the MSDS sheet on the mason stain website) contains silica, vanadium
> trioxide, zirconium oxide. If you use a "standard" mason stain that is n=
ot
> encapsulated and contains these materials, in a slip which you use on
> greenware and then cover with a good clear (food safe) clear glaze, is th=
is
> acceptable for functional ware? My ultimate firing schedule would likely=
be
> cone 5 with holds yielding an approximate cone 6 firing.
>
> For now, I am considering using it on luminaries so they are not useable =
for
> food or liquids as they have many holes in them, but it would be great to=
be
> able to use them for food surfaces as well.
>
> I have seen testing facilities for cadmuim and lead, but how about things
> like vanadium, etc. As I am an extremely small shop, I cannot really aff=
ord
> a lot of lab testing. I can do a leaching test with vinegar but I wonder=
if
> that is enough. Curious to hear about other experiences. What other tes=
ts
> could I do at home?
>
> Also, I am curious to know if I should always wear gloves when working wi=
th
> the colored slip? I know I should wear a mask when mixing the slip.
>
> I did search the archives and there seems to have been a few discussions,
> but primarily related to cadmium. As always, any help is appreciated.
>
> Cheers, MJ
>
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