Dennis
28-07-2014, 07:26 AM
My Platinol supply was low, so it seemed a good time to try out Noirit from Cookson. Mention of the N word at the Hatton garden showroom, brought on furrowed brows and a general state of incomprehension, until I explained that it was a new product for blackening silver and would not be in the printed catalogue.
When it was brought up from the store room the litre bottle looked huge compared with my tiny 100ml bottle of Platinol at home. However the Noirit was priced at £22.50 inc. VAT, compared with £16.56 for much less Platinol.
When I enquired about printed instructions or a data sheet I was told that there were none, but I stood my ground and eventually was directed to the Cookson Customer knowledge base online. It was not possible to print this out in the showroom, because the computers were not connected to a printer. (And why was I being such a pain?)
A short trial.
On inspection the two solutions were similar in colour and looking at the data sheets the composition was comparable, except that Noirit contained caustic soda as an added ingredient.
Both liquids will attack organic substances such as hair and skin, so care must be taken against splashes, particularly when dispensing from a large bottle, and gloves must be worn. If using a brush it should be synthetic.
The results on my silver offcuts were comparable, except that the Noirit appeared to act slightly more slowly. There was no difference in the final colour, but the Platinol sample had a duller surface until rubbed up. As with Platinol, Noirit has only a very slight sulphurous smell when applied and this quickly passes.
My conclusion is that Noirit is good value for money and gives a good result. The litre bottle is rather unwieldy and might last a lifetime if you only use it occasionally. Dennis.
http://portalgc.knowledgebase.net/display/2/index.aspx?c=12004&cpc=TKvN0Y442nJq41250385h0TtoO3RuDHqcReVI&cid=11047&cat=&catURL=&r=0.556843936443329
When it was brought up from the store room the litre bottle looked huge compared with my tiny 100ml bottle of Platinol at home. However the Noirit was priced at £22.50 inc. VAT, compared with £16.56 for much less Platinol.
When I enquired about printed instructions or a data sheet I was told that there were none, but I stood my ground and eventually was directed to the Cookson Customer knowledge base online. It was not possible to print this out in the showroom, because the computers were not connected to a printer. (And why was I being such a pain?)
A short trial.
On inspection the two solutions were similar in colour and looking at the data sheets the composition was comparable, except that Noirit contained caustic soda as an added ingredient.
Both liquids will attack organic substances such as hair and skin, so care must be taken against splashes, particularly when dispensing from a large bottle, and gloves must be worn. If using a brush it should be synthetic.
The results on my silver offcuts were comparable, except that the Noirit appeared to act slightly more slowly. There was no difference in the final colour, but the Platinol sample had a duller surface until rubbed up. As with Platinol, Noirit has only a very slight sulphurous smell when applied and this quickly passes.
My conclusion is that Noirit is good value for money and gives a good result. The litre bottle is rather unwieldy and might last a lifetime if you only use it occasionally. Dennis.
http://portalgc.knowledgebase.net/display/2/index.aspx?c=12004&cpc=TKvN0Y442nJq41250385h0TtoO3RuDHqcReVI&cid=11047&cat=&catURL=&r=0.556843936443329