Any solderers here?

Grarea

Forum Plod
I have just discovered that I am not as rubbish at soldering as I thought.
(My soldering iron was rubbish)
Over the years, I have bought, found, been given various solder.
I am pretty confused.
I wondered if there is any way of finding what they are and what they are for?

I assume that some, without a label, are just cheap rubbish.
I think I want to know if they are:
Leaded/lead free.
Resin cored or something else or none.
R, RMA or RA
Tin/Lead ratio
Acid or non acid.

For example(starting with the cheap stuff) is there any way of ever knowing what these are?:
View: https://imgur.com/1ce9dOl
 
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