Sea marker dye

[Superflid]

Would this....

http://marinestore.co.uk/page/mrst/PROD/survival-equipment/PL26898/

be the same stuff as this?

Screwfix

Seems to be a price difference..... /forums/images/graemlins/wink.gif

 

[VicS]

Almost certainly except that it is fl<u>uo</u>rescein not flourescein

 

[savageseadog]

The Sea marker is red and the flourecein is green.

 

[Superflid]

[ QUOTE ]
The Sea marker is red and the flourecein is green.

[/ QUOTE ]

Are you sure? Looks fairly green!

 

[VicS]

Fluorescein is green. There is no such thing as flourescein

 

[Superflid]

No offence meant here VicS, but I'm the only one on the thread that hasn't actually spelt it at all!

Many thanks for confirming that it is the same chemical.

 

[VicS]

Sorry I just replied to the last post. It was in the quote though! Perhaps I was refering to that /forums/images/graemlins/wink.gif

I did just wonder if the sachets contained a solution. The solid may be a bit slow to disslove but but it is a pretty vivid fluorescent green once dissolved. Everybody must have seen it at some time or other I would have thought (and I thought every school boy had the correct spelling drummed into them by their chemistry teachers). Normally when I have made solutions of it I have added a little caustic soda to make the solution alkaline as it does not fluoresce in the acid form but seawater is plenty alkaline enough.

£85 per 500g from a lab chemical suppliers but the Screwfix link does not say how much you get for £6. 500g would colour half the channel I should think

 

[Superflid]

No problem VicS, been caught out by the forum "Reply" method myself.
I'll ask Screwfix how much I'd get.......

 

[tritonofnor]

I keep a tub of this in the forward locker of my dinghy - not tried it though - containers a bit smaller than a half pint glass...

 

[scuby]

Plumbworld do it in 4 & 8oz packs for a bit less. THe ideal way to use it is to load into a fabric sausage so that when immersed the dye releases slowly to produce a long plume. You need very little to colour a whole lot of water.

 

[savageseadog]

The stuff I've come accross was red.

 

[VicS]

[ QUOTE ]
The stuff I've come accross was red.

[/ QUOTE ]
Any idea what it was. A Google search just kept on turnig up the same yellow green dye.

You actually saw it in the water I suppose because fluorescein is a reddish brown powder and concentrated solutions (of its sodium salt) are also reddish in colour, the yellow green fluorescence becoming more noticeable when diluted

 

[Superflid]

[ QUOTE ]
[ QUOTE ]
The stuff I've come accross was red.

[/ QUOTE ]
Any idea what it was. A Google search just kept on turnig up the same yellow green dye.

You actually saw it in the water I suppose because fluorescein is a reddish brown powder and concentrated solutions (of its sodium salt) are also reddish in colour, the yellow green fluorescence becoming more noticeable when diluted

[/ QUOTE ]

The Plumbworld (thanks scuby) link here lists fluorescein along with red, blue, green and yellow dyes.

No idea what they contain....

 

[VicS]

It seems that the other colours used for drain tracing are just food dyes. Fluorescein is visible in very low concentrations due to its fluorescence in day light. I not so sure that food dyes will be so visible although some are pretty intense I suppose. They may well be more visible in atifical light though when there is no UV to make fluorescein show up.

 

[Superflid]

[ QUOTE ]
Sorry I just replied to the last post. It was in the quote though! Perhaps I was refering to that /forums/images/graemlins/wink.gif

I did just wonder if the sachets contained a solution. The solid may be a bit slow to disslove but but it is a pretty vivid fluorescent green once dissolved. Everybody must have seen it at some time or other I would have thought (and I thought every school boy had the correct spelling drummed into them by their chemistry teachers). Normally when I have made solutions of it I have added a little caustic soda to make the solution alkaline as it does not fluoresce in the acid form but seawater is plenty alkaline enough.

£85 per 500g from a lab chemical suppliers but the Screwfix link does not say how much you get for £6. 500g would colour half the channel I should think

[/ QUOTE ]

Just got the reply from Screwfix.

___________________________________________________________

Thank you for your recent E-mail.

This item comes in a small container which according to the image on the website contains 100g.
http://www.screwfix.com/app/sfd/sea/sear...p;x=8&y=10#

I hope that helps.
Regards,

Bob Hatcher

Product Support

_____________________________________________________________


£6 for 100g seems like a bargain!