The moistening of the Keppeler paper with hydrochloric
acid before use is essential, because if not acidified the paper is
marked by acetylene itself. The books of Keppeler papers are put up in a
case which also contains a bottle of acid for moistening them as required
and are obtainable wholesale of E. Merek, 16 Jewry Street, London, E.C.,
and retail of the usual dealers in chemicals. If Keppeler's test-papers
are not available, the purifier should be recharged as a matter of
routine as soon as a given quantity of carbide--proportioned to the
purifying capacity of the charge of purifying material--has been used
since the last recharging. Thus the purifier may conveniently contain
enough material to purify the gas evolved from two drums of carbide, in
which case it would need recharging when every second drum of carbide is
opened.
REGULATIONS AS TO PURIFICATION.--The British Acetylene
Association has issued the following set of regulations as to purifying
material and purifiers for acetylene:
Efficient purifying material and purifiers shall comply with the
following requirements:
(1) The purifying material shall remove phosphorus and sulphur compounds
to a commercially satisfactory degree; _i.
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