Posted by Rob Neal on
URL: https://www.shado-forum.com/Identified-tp1509961p1509972.html

Just as an additional aside, the water would have to be kept at a
temperature of about 80deg C for the dry ice to evaporate otherwise
the water would freeze! "Dry Ice" (Solid carbon dioxide) is a peculiar
substance in that it sublimates from a solid directly to a gas, with
no liquid state. The "smoke" you see when solid CO2 is dropped in warm
water is actually water vapour, not CO2, as the cooled gas condenses
the water droplets. One has to be careful of its use in studios, as it
can suffocate you, and also because the water vapour soaks everything
and can be hazardous around electrics.

Cheers,
Rob

--- In [hidden email], "Mark Davies" <aonq79@...> wrote:
>
> Marc comented;
>
> >Well, I don't think anyone has ever commented on the
> >dry ice before... :-) But really, it's been so long
> >since we've had anyone discuss the episodes in detail,
> >it is certainly welcome to see it again!
>
> No I don't think details of a special effect like this has been
mentioned before.
> What's more interesting perhaps is the actual mechanics of the
effect....I mean the details.Was it a case of simply lowering a
weighted container filled with dry ice into the water.I presume the
volatile reaction of the dry ice would have lasted long enough for the
effect to be filmed.You'll also notice in that shot that there is a
bright yellow light under the water that enhances the whole look of
the scene.I'll speculate that this was'nt an underwater light but a
mirror reflecting an intense spot light on set reflecting back into
the camera lens.
> This possibility is very likely considering that exactly the same
technique was used to create the glowing/pulsating UFO seen not only
in IDENTIFIED but also in COMPUTER AFFAIR,SURVIVAL and SQUARE TRIANGLE.
> To make things look even more impressive,the technicians also appear
to have used a red and purple dye mixed up with the dry ice.The whole
thing would of course been filmed in slow motion at aound 96 to 120
frames per second.
> What I think this highlights is the amount of thought,time and
preparation that goes into creating very convincing SFX shots that are
only seen on screen for a matter of seconds.
>
> Regards
>
> Mark UK
>  
>
> [Non-text portions of this message have been removed]
>