jeez not a year goes by that I don't have to clarify this.
1,4-Butanediol - melting point is about 13 degrees celcius. GHB and GBL - THIS ISN'T AN ISSUE - Smell/Taste/Look should easily determine what substance you have. It's viscous and has a pretty horrible taste. At one point we used to get 2.5L bottles of 1,4-B, that came entirely frozen. A hot water bath for a few hours would normally do - and after 15 minutes usually enough for several doses to pass the time is melted and easy to remove from the bottle. Also take not that once 1,4-b is diluted with water the freezing/melting points are thrown wayyy out of whack.
General Dosage: 2-3ml for low-medium tolerance user
GBL - Smells like paint thinner, strips the skin from your tongue and mouth if ingested undiluted - and tastes like absolute shit (honestly there is nothing out there i could compare the horridness of this compound to)
General Dosage: 1.5ml (low tolerance) 3+ml (high tolerance)
Na-GHB (The Sodium Salt of Gamma Hydroxy-Butyrate) Generally a powder diluted in water, it will taste salty and have a soapy type consistency when in pure powder form.
General Dosage: 2-5 grams (general dilution ratio should be 1g:1ml, however this is impossible to tell unless you do it yourself)