how to create authetic tears/ crying using tear blower

if your actor needs a bit of help to cry on cue try the tear blower.blow in one end standing quite close to the actors eyes, and the vapour will waft over making the actors eyes careful not to get too close as it can be very painful. NB. i have heard of a make up artist who changed the menthol crystal in the blower and didn't realise that there is cotton wool either side of the crystals which are there to make sure that a menthol crystal is not blown straight into actors eye!! which is exactly what happened, involving a trip to casualty!!