Old spare bottles, what to do?

[OOltzee]

Hello my friends,
after my wave adventure I had to visit my favourite Mathmos shop to find my smile back.
I bought an original Mathmos Iridium showcase with four lamps (yellow, green, orange and white) connected to a single basement.
It's very old and the bottles (and the spare bottles the seller gave me free) are not properly working.
Inside the liquid there is something. A sort of snow. How to say (in english is difficoult).. an ash sospension.
And the liquid itself is less then the usual.
Any suggestion?

[OOltzee]

Thank you 'baby, I'll post pictures when I'll find a place to put it on: it's big...
Yes, it is a display stand, with the big base and a wall back with the mathmos and iridium logo.
And.. do you know something about the "iridium colour boost"?
It seems to be a coloured bulb that enchances the bubbles colour. I've read they no more available. Do you think I can use a normal colored bulb? Which color?

[OOltzee]

It is a plastic table top stand. It is white, not metallic grey, with the orange logo.
Thank you for the infos, i'll check.

[OOltzee]

Here are a couple of pictures!
As you can see, the opal one has something like a white foam in the middle that doesn't melt...