Gray has an undertone of green, purple or blue... best to match those with the surrounding colors. Maria Killam (of Colour me Happy blog) has a few rules for selecting gray shades. She is working out of Canada, but translation for the paint names should be available. Her posts on gray undertones including color samples are also very informative. -VW Working with Grays: 5 Rules of Thumb By Maria Killam 1. Decide whether you want your gray to have a green, purple or blue undertone, it will make it much easier to choose. 2. Consider your fixed elements when choosing a gray undertone. 3. Work with the light in the room. 4. If the house is empty at the start of a project, do not fill the walls with 10 samples of gray paint colours. 5. Choose your fabrics first. If you look closely at this kitchen (above) the stone countertop and flooring and subway tile have a green undertone while the interior panels of the doors have been painted a blue-gray. It's subtle and doesn't look necessarily wrong (to the untrained eye) but can you see it now that I'm describing the difference? Most people can. Here is a link that might be useful: Image Source: What Everyone should know about Gray

I've found it depends. Sunlight is great, but you may want to supplement them with some grow lights to make sure they don't get too spindly, as well as turn your trays. The other trick I've heard of is using a fan to oscillate over your seedlings. A gentle breeze will help them, plus it'll circulate the air around.

I am very happy to hear my guess seems to be right. I never even thought about it until a handyman mentioned it a few years ago, but no one else has ever noted a concern. I thought vermiculite looked more like gravel, but I didn't know if asbestos came in other forms of insulation. I took another photo with my SLR with a macro lens. Looks like wool fibers and odd black spheres, I'm guessing where the fibers have melted over the years? Thank you everyone for your help!

Honey onyx backsplash just went in and nervous the BM linen white is going to appear too yellow. Don't second guess yourself. There are bold colors in that back splash and there's a good chance anything less yellow than linen white is going to create too much contrast and not in a good way.