pickling acid used by jewelers and it was in a metal contain

[golddie]

I have this pickling acid used by jewelers and it was in a metal container and it was old and rusty.
I think they are made with sulfuric acid and nitric but I am not sure.
So the rust was so much that it got mixed with the acid
This acid is in powder form
I forgot the name but it is a popular brand used by jewelers.
I would like to know if this acid is still good for pickling jewelery
If not what should I do with it

I just found a picture of the product
http://www.google.com/imgres?imgurl=http://www.sunsetcrystals.com.au/images/P/SOL80210.jpg&imgrefurl=http://www.sunsetcrystals.com.au/sparex-no.-2_pickling-compound-x-10oz.html&usg=__SCZWv9AMVnsvnIjUdLehgmNut_o=&h=363&w=363&sz=42&hl=en&start=91&zoom=1&tbnid=2zi_QV0vNv4OqM:&tbnh=126&tbnw=131&ei=_RFgTd-ZOIWdlgftzqz2Cw&prev=/images%3Fq%3Dpickling%2Bacid%26hl%3Den%26sa%3DG%26biw%3D1024%26bih%3D578%26gbv%3D2%26tbs%3Disch:10%2C2697&itbs=1&iact=rc&dur=328&oei=XP5fTef7KM-3twfU-KTOCw&page=7&ndsp=15&ved=1t:429,r:5,s:91&tx=61&ty=78&biw=1024&bih=578

 

[Drewbie]

It's sodium bisulfite apparently.

Also used to acidfiy pools "pool acid"?

 

[stihl88]

See if a strong magnet will separate the rust particles from the powder.