SeniorSchmu

Hi I have a question and anybody's help would be welcomed. I tried making aqua regia to dissolve gold nanoparticles. I tried 4:1, 3:1 and 2:1 of HCl:HNO3 concentration ratio (in volume). Everywhere I read about aqua regia, it is said that it will produce some fumes but I didn't get any. Could it be because my acids are not concentrated enough? Both have a concentration of 50%. Will it dissolve my nanoparticles anyway? Thank you