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0 ETHYL GASOLINE CORPORATION p y NEW YORK Jan u ar y 28, 1935 Su r ge o n G e n e r a l, Hugh. S Cumming, U. S. P u b lic Health S e r v i c e , W ash in gton D. C. . .. My d e a r Dr Cummings - I h ave d iscu sse d se v e r a l tim es w ith Dr. Say ers th e d e sir a b ilit y o f h avin g t h e p u b l ic H e a lt h Se r v ic e e s t a b l i s h minimum c o l o r st r e n g t h s f o r le a d e d r e g u l a r gasolin e. : As you know, th e r e g u la t io n s r e q u ir e t h a t th e g a so lin e s h a l l be "d i s t i n c t l y c o lo r e d " b u t n o d e f i n i t i o n o f t h i s t e r m h a s e v e r b e e n m ad e. We f e e l t h a t a g r e a t m a jo r it y o f th e le ad e d r e g u la r g a so lin e i s o f a s a t i s f a c t o r y c o lo r from t h i s st an d p o in t b u t a sm a ll amount h as b een so ld w h ich i s r a t h e r d o u b t fu l an d , f o r t h i s r e a so n , we t h in k i t d e s i r a b l e t o h ave minimum c o lo r st a n d a r d s s e t up f o r t h e v a r io u s sh a d e s* At p r e s e n t , t h e m ost p r a c t i c a l t h in g w ou ld seem t o b e t o e s t a b l i s h t h e se i n t e r m s o f con cen tr ation of a c e r t ain d e fin it e tr ad e - d y e . I t i s hoped t h a t la t e r by th e u se of some t y p e o f c o l o r a n a l y z e r i t may b e p o s s i b l e t o e s t a b l i s h t h e se on a r e p r o d u c ib le n um erical sc a le . We h av e a l r e a d y se n t D r . Sa y e r s some p r e l i m i n a r y sam p le s o f d yed g a s o l i n e s w h ich h e an d I h av e d i sc u s se d an d I am se n d in g h im t o d a y , f o r y o u r c o n s i d e r a t i o n , som e sam p le s o f a n um ber o f sh a d e s w h ich a r e su g g e st e d a s , p e r h a p s, s a t i s f a c t o r y minimum c o l o r s . A ll o f t h e se sam p les a r e made up t o m atch by eye ap p e ar an ce p r e se n t e d in a 3" v i sa g a u g e b y g a s o l i n e c o n t a i n in g t h e s p e c i f i e d d yed c o n c e n t r a t i o n . When t h e se gaso lin e s are so ld th rough a v isib le bow l, th e co lo r w ill be approxim ately th ree tim es a s in ten se and a rough id e a o f th e appearan ce can be ob tain ed by tu r n in g th e sam ple b o t t l e s on end an d lo o k in g t h r o u gh th em in t h a t d ir e c t i o n . The sh a d e s su b m it t e d r e p r e s e n t p r a c t i c a l l y a l l o f t h e sh a d e s em p loy ed by o u r l i c e n s e e s . Th er e may b e s l i g h t v a r i a t i o n s i n sh a d e s i n some c a s e s b u t i t i s b e lie v e d t h a t su ffic ie n t l y good m atch es can be o b t ain e d in e v e r y case t o corresp on d t o t h e se m in im a. I t vrould be ou r id e a , in c ase you ap p r ove t h e se m in im a (o r an y o t h e r m in im a w h ich y ou may s e l e c t ) t o w r it e t o e ach o f o u r l i c e n s e e s e n c lo sin g a sam ple o f t h e s o l i d dye an d in st r u c t in g th em in fu t u r e b le n d s t o add dye in an am ount, a t l e a s t , su ffic ie n t t o t h a t in d icated fo r th e p a r t ic u la r color in q u estio n . The sam p le s w h ich I am se n d in g D r . Sa y e r s a r e l i s t e d b e lo w t o g e t h e r w it h t h e d y e - st u ff c o n c e n t r at io n s t o w h ich t h e y co r r esp on d when o b se r v e d t h r o u gh t h e 3" v i sa g a u g e . Sam p le s o f t h e s o l i d dye a r e a l s o e n c lo se d so t h a t y o u r own l a b o r a t o r y can d u p l i c a t e t h e s e o r o t h e r sh a d e s i f d esir e d }.- KE 0 0 09323 Su r ge o n G e n e r a l, Hugh S . Camming Jan u ar y 2 8 , 1935 Sam p le H o. 1 .2 - Y 50 2- A 3 - Cu 2- G 2- B 3- F Color Yellow O r an ge Amber Copper Green Blu e P urple Grams dye p e r 100 G allo n s G aso lin e 1 .2 gram s du Pon t Yellow H , 0 .6 gram s du Pon t Orange 0 .5 gram s du P on t Orange p lu s 0 .0 6 gram s du P on t Red 0 .7 gram s P at e n t Ch em ical P e t r o l Copper 1 .5 gram s Eth y l Green / 1 .0 gram s P aten t Ch em ical Eth y l Blue 1 .2 5 gram s P aten t Ch em ical P e t r o l P u r p le 3R ' The d r y dye sam p le s a r e a s fo llo w s:: 0-25 du Pon t Orange Y-33 du Pont O il Yellow H B- 2 9 P at en t Ch em ical E t h y l Blue G-4 E t h y l Green P e t r o l Copper P a t e n t Ch em ical Company P e t r o l P u r p le 3R P a t e n t C h e m ical Company ' I f t h e se sam p les m eet w it h y o u r a p p r o v a l, we w i l l a p p r e c ia t e y ou r ad v ice a c c o r d in gly , and i f you f e e l t h a t th ey a r e n o t s a t i s f a c t o r y , we w ill be g la d t o work w ith you fu r t h e r and su bm it o t h e r sam p les a s you may su g g e st . Very t r u ly y o u r s, ge/l r j c e : Dr. R. R. Say er s Graham Ed gar KE 0009330