Tarrant, Derek on wed 23 mar 05
Ama Menec wrote: -
"I'm hoping someone on clayart can advise about protecting a ceramic
sculpture, glazed with a low-fire matt lithium glaze, from excessive algal
growth and such..........."
Dear Ama,
Algae certainly like your conditions and can be defeated with commercial
chemical algaecides but these are difficult to obtain and toxic. Contact
your local paint supplier, they may have some algae control additives for
emulsion paint that could be used in your water sealer.
There is also one additive that is reasonable if you can get a sample.
Zinc Omadine from OLIN PERFORMANCE CHEMICALS. This is used in hair shampoo
as an anti dandruff additive so it is safer. If you are using a latex
water sealant (as opposed to a solvent-based water repellent) you can ask
for a 50 cc sample of Zinc Omadine dispersion and add this to 1 gallon of
your latex water sealer.
Failing that a home remedy could be to use dilute Copper sulphate solution.
This can be bought across the counter as a root control additive for the
leach fields of septic systems or a product called BAN-WEED if that is sold
in the UK. Dissolve some Copper sulphate in water and mix it with the
latex water sealer. Use about 1/2 teaspoon mixed in 1/4 pint of water and
add this to one gallon of sealer. Try a small quantity pre-mix first, some
latex emulsions don't like Copper. You will know there is a problem if it
curdles, thickens excessively or separates.
If the emulsion objects try a bottle of colloidal Silver added to the water
sealer. Silver is highly algaecidal and anti-bacterial. You can get
colloidal silver from health food shops although they do like charging a lot
for it.
Contact me off line if you need more help
Best Regards,
Derek in Weaverville, NC
Malcolm Schosha on wed 23 mar 05
This is a link to the Material Saftey Data Sheet for Zinc Omadine, as
a PDF file.
http://www.msds.com.au/data/msds/msds/23103948.pdf
Basicly it says the toxicity is untested. That is pretty much the way
things are with most chemicals in use. That includes much of what is
used in beauty products. (I have been hearing a lot about this
recently because my daughter had been looking into the subject of
untested meterials in beauty products.)
Malcolm Schosha
...............
--- In clayart@yahoogroups.com, "Tarrant, Derek"
wrote:
> Ama Menec wrote: -
>
> "I'm hoping someone on clayart can advise about protecting a ceramic
> sculpture, glazed with a low-fire matt lithium glaze, from
excessive algal
> growth and such..........."
>
> Dear Ama,
>
> Algae certainly like your conditions and can be defeated with
commercial
> chemical algaecides but these are difficult to obtain and toxic.
Contact
> your local paint supplier, they may have some algae control
additives for
> emulsion paint that could be used in your water sealer.
>
> There is also one additive that is reasonable if you can get a
sample.
> Zinc Omadine from OLIN PERFORMANCE CHEMICALS. This is used in
hair shampoo
> as an anti dandruff additive so it is safer. If you are using a
latex
> water sealant (as opposed to a solvent-based water repellent) you
can ask
> for a 50 cc sample of Zinc Omadine dispersion and add this to 1
gallon of
> your latex water sealer.
>
> Failing that a home remedy could be to use dilute Copper sulphate
solution.
> This can be bought across the counter as a root control additive
for the
> leach fields of septic systems or a product called BAN-WEED if that
is sold
> in the UK. Dissolve some Copper sulphate in water and mix it with
the
> latex water sealer. Use about 1/2 teaspoon mixed in 1/4 pint of
water and
> add this to one gallon of sealer. Try a small quantity pre-mix
first, some
> latex emulsions don't like Copper. You will know there is a
problem if it
> curdles, thickens excessively or separates.
>
> If the emulsion objects try a bottle of colloidal Silver added to
the water
> sealer. Silver is highly algaecidal and anti-bacterial. You can
get
> colloidal silver from health food shops although they do like
charging a lot
> for it.
>
> Contact me off line if you need more help
>
> Best Regards,
>
> Derek in Weaverville, NC
>
>
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