What can I do with dry ammonium tetrachloroplatinate (II) salt 0.8g

I bought an unused PP kit on Ebay. It's great, the only missing thing is developer, which is trivially easy to buy. The whole thing ended up vastly cheaper than if I'd bought it from the US.
The seller included a small tub with the above mentioned dry ammonium tetrachloroplatinate (II) salt 0.8g as an extra and I've no idea what to use it for.
Initially I thought of making toner with it, but the only recipe I found needs a different planinate salt.
I'm not a chemist, so while I will find a use for this in time I don't know the different between an ammonium one and the Potassium one that recipe required.

I do intend to start mixing my own for the various processes I'm starting to learn, mainly because it works out cheaper, I'm right at the start of this and didn't expect to be 'given' this bottle of platinate salt. Really I'm at a loss for what to do with it.

Any suggestions?

If you want to use the ammonium salt in place of the potassium salt using 90% of the weight indicated for the potassium compound will give you the same amount of platinum in the solution.

That factor is derived from the formula weights of the respective compounds... the ammonium compound has a formula weight of 373 and the potassium compound is 415. Thus, 373/415=0.9

I don't think that the replacement of potassium for ammonium should matter for use in a toner, but that is only an educated guess. I have not done the experiment so I can't say for sure!

Thanks!
It's worth a try since I didn't pay for it. I would like to Platinum tone some other stuff I want to do, so this would mean no need to buy that toner if it works.
I could just try with half of it I suppose. I'll be buying more to make my own PP stuff in time. I got this kit to learn the process. It seems pretty clear that buying the chemical ingredients directly is the better long term approach.