look up chinese medicine on the internet- there are various websites which explain what all these coatings mean. Thick white coating is a sure sign of candida in your stomach and as it gets better it tends to go yellower. Although this is a sign of you beginning to beat the candida- the yellow is a sign that your stomach is still damp (ie perfect candida conditions). Concentrate on keeping all your foods warm (easy to digest and don't allow the conditions to get worse). So it's definitely a positive sign but just still a bit of a way to go yet.