Welcome to Librarium Online!
I've no idea where this should actually go because it's sorta about everything. Anyway, here are my questions.
1. i'm using bicarb of soda to make my bases and love the effects the putty like stuff gives like footprints in the snow. Is bicarb a good idea or do i need baking soda?
2. I'm doing a board like this but that'd be a $h!7 load of bicarb so would painting it grey then drybrushing white look ok? I could buy a lot of bicarb, it's just it would take a long time.
3. as far as doing blood effects on snow from what I remember it's put some water where you want the blood to be and then put a drop of red in the middle and let it naturally spread out, then gloss right?
4. Snow camo on scouts- I've done their faces as a heavy drybrush of white over the skin then some lines of grey, shadow grey and a few drops of ice blue. Same for the camo cloak. Is this a good way to do it or could you helpfull people think of a better way?
I think that just about covers it. Thanks for reading it.
No one can help?
The bicarb of soda is the same as baking soda. If you end up using this instead of snow flock you will have to seal the soda with a varnish to prevent mold. For the fresh blood on snow i add a drop of water where i want it and then add a drop of tamiya clear red. Once that dries up i then add some more clear red in the center to darken it.
If you are going to do a board with snow you should consider that perhaps you don't need to cover all of it. Therefore you won't go bankrupt on an apparent bicarb of soda fetish. Often snow will end up in heaps and chunks about the place as people walk on it and it melts. In your case it will be a case of people shooting lazer cannons and what not about the place. Do heaps of snow here and there and paint the rest of the ground in whatever way you want. Your Scouts don't have pure white all over them. Though I would suggest cold colours such as grey to make it look like winter.
To make the area look cold you could consider a few other effects to indicate the effects of winter. A small frozen pond will work to make the place look cold. Water effects could do that. Add a little watered down white to the water effects and it might help it look cloudy like ice is. Use some snow at the edges to help make it look cold. Also drybrushing white onto trees will help it look like some snow has landed on them.
Be careful with blood on snow. A drip of water may flatten the area where you intend the blood to go. Before the blood is added consider this may resemble a small jellyfish in the snow. Now add the blood and you may get a bloody jellyfish! Jellyfish of blood are rather odd. I think your approach may be a little to complicated, or at the very least you need to be very careful. There is one way to know. Create some bases as you would for your models with no actual models on them. Try out your desired method on this test base. If it works go for it, if it does not then you won't of ruined the base of any models.
I think what you have described sounds like snow-camo. I think that it will work well when these models are alongside other models. What I mean is one day I wore white and it did not seem odd. Then it snowed and I went out wearing white and I blended in with my surroundings. People said it was like I was wearing snow-camo for some reason known only to myself. I think that your scouts will seem to be wearing snow-camo on your snow-table as other models run about without any visible snow-camo.