I would like to ask, is it slowly boiling butane {brown colour} and a rapid boiling butane ?{yellow colour}
https://www.icmag.com/ic/picture.php?albumid=77828&pictureid=1874965https://www.icmag.com/ic/picture.php?albumid=77828&pictureid=1874965View Image
https://www.icmag.com/ic/picture.php?albumid=77828&pictureid=1874966View Image
Is this rapidly boiling butane because of not so cold (frozen) sight glass or it is low pressure inside?
https://www.icmag.com/ic/picture.php?albumid=43030&pictureid=1101775
and is it enought pressure inside, or sight glass is frozen so that butane doesn't boil rapidly?
https://www.icmag.com/ic/picture.php?albumid=43030&pictureid=1101774