Problem with acid etching

Tried acid etching my blade with ferric chloride but the results were worse than i was expecting,this is the knife after putting it on its sheath about 10 times, i left the knife in the chloride for over 30 mins im not sure what im doing wrong, its coming off very easily and it didnt darken as much considering how long i left it in, i used straight ferric chloride, didnt water it down or mix it with anything, also its probably not the steel since i did a couple clips and they turned out the same. Does anyone have any idea of what i did wrong? Any tips appreciated!