"Rusty Hinge 2" wrote in message
k...
The message
from "Rupert" contains these words:


"thesquire" wrote in message
...
I have been told on good authority that the talc powder based
preparations lose their effectiveness after about eight months, even
if kept in a closed container and refrigerated.
snip

Which good authority has given you this information? IMHO they are
talking
nonsense.
I suppose it depends what the formulation contains.
Normal stuff contains Indolebutyric acid and /or Naphthylacetic acid with
other bits and pieces such as fungicide in a talc powder carrier.
These ingredients are stable indefinitely (as a solid) if stored away
from
light.

This may be true, but it could also be that they react with each-other.

Citric acid is stable, as is bicarbonate of soda, but mixed, they are
not. Over a period of time they will inter-react, and with considerable
vigour if water gains access.

--
Rusty
Direct reply to: horrid dot squeak snailything zetnet point co period uk
Separator in search of a sig

Citric acid and sodium bicarbonate when mixed as solids do not react.
Andrews liver salts /Alka-Seltzer the above mixture only fizz with water.

Indolebutyric acid/Naphthylacetic acid are stable and do not react.