non-yellowing       
adjective (also nonyellowing) uk/ˌnɒnˈjel.əʊ.ɪŋ/ us/ˌnɑːnˈjel.oʊ.ɪŋ/
 不会发黄的
that does not turn yellow
  Make sure that you use paints with non-yellowing additives for the woodwork to get that professional look.
 In a final step, she applied a non-yellowing varnish to the painting to protect it and bring out the colours. 在最后一步,她给画作涂上了不会发黄的清漆,这样可以保护画作并使其色彩更加鲜明。 
 - More examples
 - I always choose a non-yellowing product when varnishing woodwork to prevent any later discolouration.
 - This new brand of nail polish is guaranteed to be non-yellowing and remain 100% clear.
 - They applied a non-yellowing epoxy resin to seal the floor.