How to determine the size of vein? Can I use white milk?

Yes, an adhesive layer can be added. Firstly, the raw materials of the adhesive layer are prepared according to the ratio of PVC: Arabic gum: titanium dioxide: water = 10g: 3g: 2g: 100ml, and then heated for 5-7hr to form a thin paste liquid. After cooling, add water-based varnish according to 50% of the paste liquid weight and stir evenly. Finally, spread the solution evenly on the leaves.