Using hardware node coloring with Minetest.

glass_node_color.lua

local function dig_glass(pos, node, digger)
	local inv = digger:get_inventory()
	local can_dig = not core.is_protected(pos, digger:get_player_name())
	local drops = {}
	
	if digger:is_player() then
		local meta = core.get_meta(pos)
		
		if can_dig then
			if not inv:room_for_item('main', node.name) then
				table.insert(drops, node.name)
			else
				inv:add_item('main', node.name)
			end
			
			if meta then
				local dye = meta:get_string('dye')
				
				if dye and dye ~= '' then
					if not inv:room_for_item('main', dye) then
						table.insert(drops, dye)
					else
						inv:add_item('main', dye)
					end
				end
			end
		end
	end
	
	if can_dig then
		core.remove_node(pos)
		core.handle_node_drops(pos, drops, digger)
	end
end