Silver Spray On Instead of Alumnimizing?
Posted 22 October 2013 - 02:26 PM
I see it is been used on the 70" scope thread but never heard of such a product.
Posted 22 October 2013 - 02:48 PM
Posted 22 October 2013 - 11:19 PM
Posted 23 October 2013 - 05:32 AM
Getting the right thickness of deposit to provide reflection, but without distorting the figure would be tricky. I believe the thickness needs to be in the order of 3 or 4 molecules? (ISTBC).
Posted 23 October 2013 - 11:12 AM
Thanks for the tip. It looks like the spray silver concentrate 120mL plus spray silver activator 500mL and spray silver reducer can be gotten for less than $100.
Spray on my silver using weed spray gun. Angel Gilding for the chemicals. Easy to do, and inexpensive.
This covers 133 sq ft. Very reasonable for large quantity of small mirrors or a even a few 1m size mirrors.
Posted 23 October 2013 - 12:20 PM
Posted 23 October 2013 - 12:24 PM
Posted 23 October 2013 - 02:53 PM
I like to see a photo of an example
Posted 23 October 2013 - 03:05 PM
Get enough to practice on scrap glass first. 70-inch Mike told me that he had to practice a bit before he nailed his technique.
Wouldn't you want to practice on a good test mirror (you can strip and recoat repeatedly) so that you verify the coating is performing optically?
Posted 23 October 2013 - 03:19 PM
Posted 23 October 2013 - 07:22 PM
Does anyone know what standard silvering technique this is similar to?
Rochelle Salts? Brashear?
Posted 23 October 2013 - 07:42 PM
Posted 24 October 2013 - 01:08 PM
Posted 24 October 2013 - 03:21 PM
Perhaps there is a spray on antireflection coating as well, that would be really crazy!
Most AR coating needs to be applied in very precise thickness to work but there are chemical means to "stain" the top layer of the glass and form an anti-reflective coating. Certain glasses can be dipped in acid which removes some of the metal ions on the surface forming an antireflective coating only a few atoms thick
by changing the refractive index of the top surface.
Posted 25 October 2013 - 05:10 PM
Clear Dark Skies
Posted 25 October 2013 - 05:37 PM
Posted 26 October 2013 - 08:16 AM
Solution then after x time taken out
Sprayon seems to crude but what the hell do iknow
Next someone will say youcan use a 5 buck home depot brush
Posted 26 October 2013 - 08:19 AM
Butif davidg says its valid it most likely is