Reddit reviews 1/2 Pound Hot Hide Glue for Instrument Making and Fine Cabinet Work

https://www.amazon.com/dp/B07PKFKT27/ref=cm_sw_r_sms_apa_i_k7IWDbAGRDBEX

It won't be labeled as horse glue, but as animal glue.

Uhh, I've never seen hide glue in that configuration, just in a regular bottle like that. In luthiers' shops I've been in, you have to warm it up to melt it properly before you use it. That probably has some weird additives that keep it liquid and stable, but I'd worry they also make it not ideal for luthierie.

Edit: You actually want something more like this.