I have a tamarind problem in my Pad thai recipe?

Most of the recipes for Pad thai calls for tamarind, but i couldn’t find it before. i finally found tamarind in an Indian store.

One was a block of black tamarind wrapped in plastic. Second was a small jar of tamarind concentrate which was very dark black. Third was a jar of tamarind sauce made by Knorr. This one was red.

I thought this was very stange indeed, b/c I’ve eaten pad thai before and it usually had a reddish color to it. But the tamarind i’ve found here is all black except the tamarind sauce from Knorr. i bought the tamarind concentrate, and now i think i made a mistake by buying this.

Did I buy the right thing?? I read somewhere tamarind is supposed to be red not this dark black sauce. how am i supposed to use this black tamarind concentrate? would it make my pad thai very black?

I want to make a really good pad thai something that is more suited to my palette. I don’t like the heavy thick pad thai sold in my local thai places.