First DCG, Please, Help me find the problem.
Posted: Sun Jan 18, 2009 3:42 pm
Hi guys,
long time since my last post.
anyway yesterday night i started my first two DCG exposures and well, i got nothing.
thats always happening to me when i try something new in holography it doesnt work out.
10 hours of setting up, exposing and developing for nothing...
please help me find the problem:
my setup hasnt changed since my successful silver halide work, still denisyuk setup with object ontop of film (distance 2 cm).
new green laser 315m though (100mw)
i sticked very close to the instruction given in the wiki:
-i coated using veil coating.
-let the plate dry for aprox. 3 days in a cool room. open window so outside temperature maybe 5-10°C
-mixed the G307 formula (0,5g glycerin 100% , 0,3g aluminum sulfat anhydrous 51-59%, 5g potassium dichromate, 100ml water) and cooled it down
-switched redlight on
-sensetized the plates for 30 sec
-wiped the back and dryed each plate with hairdryer cool setting for 1 minute
-put them all in a light and airtight box
-turned on the laser
-let the whole table rest for 5 min and exposed 20sec
-let plate in position fordark reaction 5 min (red light was on though)
-put the plate in the oven for 2 min at 100°C
-took it out and cooled on a metal plate for 1 minute
-put it in a first DI waterbath to wash out dichromate for 3 min
-then second bath for 3 min
-switched on a halogen light shining on the plate while blowing with a hairdryer on cool setting for about 1 minute on it until it seemed dry.
put the plate in a 70% Isopropyl alcohol bath for 15 sec, then quickly in 90% Isopropyl alcohol for another 15 sec, then 2 min in a 99% Isopropyl alcohol HOT bath.
-then i felt quite dizzy, beacause of all the alcohol in the air
-the wiki quoted that i should be able to start seeing something in the 99 percent bath, i saw nothing
-well already disappointed i took the plate out of the bath an dried it for about 3 min with a hairdryer at maximum heat and power very colse to the plate.
-there was nothing. The Plate looked just perfectly clear expect a slight yellow stain from the dichromate.
thinking to myself that the problem might be due to underexposure i repeated the same process exposing for 160 seconds (2min40)
same result.
very disapointed i went to sleep....
How vulnerable is DCG to agitation during exposure. I build a table with innertubes and it worked out fine for silverhalide work, but im still living in an appartment house so vibration is always my concern. Long DCG exposure times could be problematic.
i attached two pictures showing my poor results. (actually they show nothing, but thats all i got)
have a nice day
long time since my last post.
anyway yesterday night i started my first two DCG exposures and well, i got nothing.
thats always happening to me when i try something new in holography it doesnt work out.
10 hours of setting up, exposing and developing for nothing...
please help me find the problem:
my setup hasnt changed since my successful silver halide work, still denisyuk setup with object ontop of film (distance 2 cm).
new green laser 315m though (100mw)
i sticked very close to the instruction given in the wiki:
-i coated using veil coating.
-let the plate dry for aprox. 3 days in a cool room. open window so outside temperature maybe 5-10°C
-mixed the G307 formula (0,5g glycerin 100% , 0,3g aluminum sulfat anhydrous 51-59%, 5g potassium dichromate, 100ml water) and cooled it down
-switched redlight on
-sensetized the plates for 30 sec
-wiped the back and dryed each plate with hairdryer cool setting for 1 minute
-put them all in a light and airtight box
-turned on the laser
-let the whole table rest for 5 min and exposed 20sec
-let plate in position fordark reaction 5 min (red light was on though)
-put the plate in the oven for 2 min at 100°C
-took it out and cooled on a metal plate for 1 minute
-put it in a first DI waterbath to wash out dichromate for 3 min
-then second bath for 3 min
-switched on a halogen light shining on the plate while blowing with a hairdryer on cool setting for about 1 minute on it until it seemed dry.
put the plate in a 70% Isopropyl alcohol bath for 15 sec, then quickly in 90% Isopropyl alcohol for another 15 sec, then 2 min in a 99% Isopropyl alcohol HOT bath.
-then i felt quite dizzy, beacause of all the alcohol in the air
-the wiki quoted that i should be able to start seeing something in the 99 percent bath, i saw nothing
-well already disappointed i took the plate out of the bath an dried it for about 3 min with a hairdryer at maximum heat and power very colse to the plate.
-there was nothing. The Plate looked just perfectly clear expect a slight yellow stain from the dichromate.
thinking to myself that the problem might be due to underexposure i repeated the same process exposing for 160 seconds (2min40)
same result.
very disapointed i went to sleep....
How vulnerable is DCG to agitation during exposure. I build a table with innertubes and it worked out fine for silverhalide work, but im still living in an appartment house so vibration is always my concern. Long DCG exposure times could be problematic.
i attached two pictures showing my poor results. (actually they show nothing, but thats all i got)
have a nice day